Which of the following statements are true about "hypothesis"?

A. The minor premise of the older deductive method was gradually replaced by hypothesis.

B. Snow (1973) described six levels of theory, with the first level being hypothesis formation.

C. For the hypothesis to be testable, the variables must be operationally defined.

D. The most common use of hypothesis is to test whether an existing theory can be used to solve a problem.

E. The hypothesis focuses the investigation on indefinite targets.

Choose the correct answer from the options given below: