Which area formula or formulas show(s) a joint variation?
I. A = s^2
II. A = πr^2
III. A = l * w
A. II only
B. II and III
C. III only
D. I, II, and III
I. A = s^2
II. A = πr^2
III. A = l * w
A. II only
B. II and III
C. III only
D. I, II, and III