After reviewing several topics, an instructor decides to ask the learners some review questions. After asking the first question, one of the learners answered incorrectly. Which of the following is the BEST approach for the instructor to take?

Allow another learner to answer the question and continue training 

Ask the learner to stay after class for a review of the material 

Ask the learner to research the correct answer 

Explain the correct response and provide positive and constructive feedback