What is the recommended way to power up VxRail E, V, P, and S Series nodes?

What is the recommended way to power up VxRail E, V, P, and S Series nodes?
A . Ensure the System Health indicator blinks amber for 10 minutes after power on
B . Use the power button on the rear panel to power on each node
C . Wait at least 30 seconds between powering up each node
D . Use the iDRAC interface to power on each node

Answer: B