What is the correct order of events during maintenance window?

A user has launched an RDS MySQL DB with the Multi AZ feature. The user has scheduled the scaling of
instance storage during maintenance window. What is the correct order of events during maintenance
window?
Perform maintenance on standby
Promote standby to primary
Perform maintenance on original primary
Promote original master back as primary

A.
1, 2, 3, 4

B.
1, 2, 3

C.
2, 3, 1, 4

Explanation:
Running MySQL on the RDS DB instance as a Multi-AZ deployment can help the user reduce the impact of a
maintenance event, as the Amazon will conduct maintenance by following the steps in the below mentioned
order:
Perform maintenance on standby
Promote standby to primary
Perform maintenance on original primary, which becomes the new standby.