When the amplitude of oscillation of a simple pendulum is not small, how does its period differ from that given by the Simple Harmonic Motion (SHM) expression T = 2π/√L/g ?

A The actual period is always less than the SHM expression gives.
B. The actual period is always greater than the SHM expression gives.
C. The actual period can be less than, greater than, or equal to the SHM expression depending on the actual amplitude.
D. The expression presented and discussed in the textbook doesn't lend itself to such analysis.