Use the function below:

trig graph with points at 0, 1 and pi over 2, 5 and pi, 1 and 3 pi over 2, negative 3 and 2 pi, 1

What are the amplitude and midline?

Amplitude: 5; midline: y = 1
Amplitude: 5; midline: y = 0
Amplitude: 4; midline: y = 1
Amplitude: 4; midline: y = 0