How will the reload of these switches proceed to result in the default initial state?

Two (2) Dell EMC Networking OS10 switches in a VLT configuration need to be upgraded.

How will the reload of these switches proceed to result in the default initial state?
A . Reload the primary VLT node. This process will automatically trigger the reload of the secondary node after it has completely recovered.
B . Reload the primary VLT node and wait for it to join as secondary. Wait until after delay restore timer has expired. Reload VLT secondary node and wait for it to join as secondary.
C . Reload the primary VLT node.This will automatically trigger the simultaneous reload of the secondary node.
D . Reload the primary VLT node and wait for it to join as primary. Wait until after delay restore timer has expired. Reload VLT secondary node and wait for it to join as secondary.

Answer: B