The action ‘STACK(A, B)’ of a robot arm specify to _______________ A. Place block B on Block A B. Place blocks A, B on the table in that order C. Place blocks B, A on the table in that order D. Place block A on block B

The correct answer is: D. Place block A on block B.

The action ‘STACK(A, B)’ of a robot arm specifies to place block A on block B. This means that the robot arm will first pick up block A, then pick up block B, and finally place block A on top of block B.

Option A is incorrect because it specifies to place block B on block A. This is not the same as the action ‘STACK(A, B)’.

Option B is incorrect because it specifies to place blocks A, B on the table in that order. This is not the same as the action ‘STACK(A, B)’.

Option C is incorrect because it specifies to place blocks B, A on the table in that order. This is not the same as the action ‘STACK(A, B)’.