Which of the following analytical statements regarding the role of reinforcement is most accurate among Thorndike's 'Law of Effect', Pavlov's 'Classical Conditioning', and Skinner's 'Operant Conditioning'?

In Thorndike's 'Law of Effect' and Skinner's 'Operant Conditioning', a satisfactory outcome or reinforcement is given after the organism makes a response, which increases the likelihood of repeating the behavior. In contrast, in Ivan Pavlov's 'Classical Conditioning', the unconditioned stimulus is always presented just before the response.