As mixed-doubles teammates in tennis, kara and tran are trying to devise their best strategy against an opponent that has two excellent servers but, their physical fitness level is not as good as kara and tran’s.

how can kara and tran use their superior cardiovascular endurance to win the match:

use the entire court to place serve returns.
use a short drop shot when their opponents are close to the net.
use a long baseline shot when their opponents are far away from the net.
all of the above