To Answer This Question, Circle the Correct Letters in the Boxes

Short Answer

To answer this question, circle the correct letters in the boxes. Be careful on this one. The components in this table are not arranged as they were in the text, so the answers aren't in the same positions as in the text.
$$\begin{array} { | c | c | c | } \hline & \text { Remove } & \text { Present } \\\hline \text { Reinforcer } & \text { a b c d } & \text { a b c d } \\\hline \text { Aversive } & \text { a b c d } & \text { a b c d } \\\text { Stimulus } & & \\\hline\end{array}$$ a. Positive reinforcement
b. Positive punishment
c. Negative reinforcement
d. Negative punishment