Final answer:
The subject is Sports, specifically tennis strokes. A lob is a high and deep defensive stroke in tennis, used to force the opponent back. Other strokes mentioned are smash, drive, and drop.
Step-by-step explanation:
The subject of this question is Sports, specifically related to the stroke in the game of tennis.
A rarely used high and deep defensive stroke in tennis is a "Lob". A lob is a stroke that sends the ball high and deep into the opponent's court, with the intention of forcing the opponent to retreat and giving the lobber more time to recover.
Other strokes mentioned in the question are:
Smash - a forceful overhead shot played from above the hitter's head.
Drive - a powerful and fast shot played with a flat trajectory.
Drop - a soft shot that causes the ball to drop close to the net.