Giving Brainliest to the first answer that's correct!!! Triangle X Y Z is shown. Angle Z W X is a right angle. An altitude is drawn from point W to point Y on side Z X to form a right angle. The length of W Y is 4, the length of Y X is a, the length of Z Y is 3, the length of Z W is c, and the length of W X is b.
What is the value of a?

A.) 5 units
B.) 5 and one-third units
C.) 6 and two-thirds units
D.) 7 units