Which transformations are needed to change the parent cosine function to y=3cos(10(x−π))?
a. Vertical stretch of 3, horizontal compression to a period of π/5​, phase shift of π units to the right
b. Vertical stretch of 3, horizontal compression to a period of π/5​, phase shift of π units to the left
c. Vertical compression of 3, horizontal stretch to a period of 10π, phase shift of π units to the right
d. Vertical compression of 3, horizontal stretch to a period of 5π, phase shift of π units to the left