(a) A Notice of Reasonable Cause shall be served on a respondent as follows:

(1) To individuals. A Notice shall be served on a respondent that is a natural person by delivering a copy of the Notice to the individual or to an agent authorized by appointment or by law to receive such a Notice. Delivery, for purposes of this paragraph, means handing a copy of a Notice to the individual; or leaving a copy at the individual's office with a clerk or other person in charge thereof; or leaving a copy at the individual's dwelling house or usual place of abode with some person of suitable age and discretion then residing therein; or sending a copy of a Notice addressed to the individual through the U.S. Postal Service by Registered Mail, Certified Mail or Express Mail delivery, or by third-party commercial carrier, for overnight delivery and obtaining a confirmation of receipt.

(2) To corporations or entities. Notice shall be served on a person other than an individual by delivering a copy of a Notice to an officer, managing or general agent, or any other agent authorized by appointment or law to receive such a Notice, by any method specified in paragraph (a)(1) of this section.

(3) Upon persons registered with the Bureau. In addition to any other method of service specified in paragraph (a)(1) or (2) of this section, Notice may be served on a person registered with the Bureau by sending a copy of a Notice addressed to the most recent business address shown on the person's registration form by U.S. Postal Service Certified, Registered, or Express Mail and obtaining a confirmation of receipt or attempted delivery.

(4) Upon persons in a foreign country. Notice may be served on a person in a foreign country by any method specified in paragraph (a)(1) or (2) of this section, or by any other method reasonably calculated to give notice, provided that the method of service used is not prohibited by the law of the foreign country.

(5) Record of service. The Bureau shall maintain a record of service of a Notice on a respondent, identifying the party given Notice, the method of service, the date of service, the address to which service was made, and the person who made service. If service is made in person, the certificate of service shall state, if available, the name of the individual to whom a Notice was given. If service is made by U.S. Postal Service Registered Mail, Certified Mail, or Express Mail, the Bureau shall maintain the confirmation of receipt or attempted delivery.

(6) Waiver of service. In lieu of service as set forth in paragraph (a)(1) or (2) of this section, a person may be provided a copy of a Notice by First Class Mail or other reliable means if a written waiver of service is obtained from the person to be served. In the case of a respondent that is not a natural person, a written waiver may be provided by an officer, managing or general member, or partner authorized to represent the respondent.

(b) The initiating official shall promptly submit a copy of a Notice and a copy of the certificate of service to the Associate Director.