Identify Equilibrium Values and Determine Which Are Stable and Which

Multiple Choice

Identify equilibrium values and determine which are stable and which are unstable.
-y = (y - 4) (y - 6) (y - 7)

A) y = 7 is a stable equilibrium value and y = 6 and y = 4 are unstable equilibria.
B) y = 4 is a stable equilibrium value and y = 6 and y = 7 are unstable equilibria.
C) y = 6 is a stable equilibrium value and y = 4 and y = 7 are unstable equilibria.
D) y = 5, y = 4 and y = 7 are unstable equilibria.