A sine curve with a period of 4π, an amplitude of 5, a left phase shift of π/4, and a vertical translation down 1 unit.

a) y = 5 sin(4x - π/4) - 1
b) y = 5 sin(4x + π/4) - 1
c) y = -5 sin(4x - π/4) + 1
d) y = -5 sin(4x + π/4) + 1