An Amazon Redshift cluster with four nodes is running 24/7/365 and expects potentially to add one on-demand node for one to two days once during the year. Which architecture would have the lowest possible cost for the cluster requirement?Choose the correct answer from the below options:
A. Purchase 4 reserved nodes and rely on on-demand instances for the fifth node, if required.
B. Purchase 5 reserved nodes to cover all possible usage during the year.
C. Purchase 4 reserved nodes and bid on spot instances for the extra node if required.
D. Purchase 2 reserved nodes and utilize 3 on-demand nodes only for peak usage times.
