Which of the following functions is represented in the graph?

cosine graph with points at 0 comma 3, pi comma negative 5, and 2 times pi comma 3

f(x) = 4cos(2x) + 3

f(x) = 8cos(2x) + 3

f(x) = 4cos(x) − 1

f(x) = 8cos(x) − 1