The destruction of living organisms shall be performed in one of the following methods:

(a) The complete in-container method, by heating the container and contents to a range of 212 °F to 280 °F for a sufficient time;

(b) By a continuous flow process at or above 280 °F for at least 2 seconds, then packaged aseptically;

(c) The product is first processed according to methods as in paragraph (b) of this section, then packaged and given further heat treatment to complete the process.