What is the test for determining whether an administrative agency has made a finding that an administrative decision was correct?

7 We are mindful that " '[t]he findings and the determination [of the administrative agency] come before the reviewing court with a strong presumption as to their correctness and regularity. Thus, it is presumed ... that the necessary facts to support the determination were ascertained and found, that the agency duly considered the evidence adduced at the administrative hearing, that official duty was regularly performed, and that the agency applied the proper standard or test in reaching its decision.' " (Faulkner v. California Toll Bridge Authority (1953) 40 Cal.2d 317, 330, 253 P.2d 659.)