The periodic function y = g(x) has a period of 6. It is known that g(1) = g(7) = 0, and that g(5) = 3 is a relative maximum of g. Which of the following must also be true
a. The function g must be increasing on 0 0 for all values of .
b. g(x)≥ 0 B for all values of x.
c. g(18)= g(4)
d. (3)=g(27)