Aresponse is learned most rapidly and is most resistant to extinction if it is acquired under conditions of reinforcement followed by reinforcement.

continuous; intermittent                                                                  

Explanation:

Continuous reinforcement: In psychology, the term continuous reinforcement is defined as a learning method that impels an animal or a person to repeat a specific behavior. In other words, this is one of the principles in operant conditioning that impels an organism to give rise to a particular response after getting reinforced every time the organism produces a response.

Intermittent reinforcement: In psychology, the term intermittent reinforcement is also referred to as partial reinforcement and is defined as a process of reinforcing specific responses that are considered as correct rather than reinforcing all responses.