The fundamental period T of a periodic-continuous time signal x(t), is

A. the smallest positive constant satisfying the relation x(t) = x(t + mT) for every t and any integer m

B. the positive constant satisfying the relation x(t) = x(t + mT) for every t and any integer m

C. the largest positive constant satisfying the relation x(t) = x(t + mT) for any t and any integer m

D. the smallest positive integer satisfying the relation x(t) = x(t + mT) for any t and any m

Answer: Option A