In the piecewise function shown below, what is the f(10)?

f(x) =
{ x + 5 i f x ≤ 5
{ x^2 i f x > 5

A. f(10) = 100
B. f(10) = 15
C. f(10) = 100 AND f(10) = 15
D. f(10) doesn't exist.