Provisioned IOPS Costs: you are charged for the IOPS and storage whether or not you use them in a given month.

True.

EBS Provisioned IOPS SSD (io1) Volumes

Volume storage for EBS Provisioned IOPS SSD (io1) volumes is charged by the amount you provision in GB per month, until you release the storage. With Provisioned IOPS SSD (io1) volumes, you are also charged by the amount you provision in IOPS (input/output operations per second) multiplied by the percentage of days you provision for the month. For example, if you provision a volume with 1000 IOPS, and keep this volume for 15 days in a 30 day month, then in a Region that charges $0.10 per provisioned IOPS-month, you would be charged $50 for the IOPS that you provision ($0.10 per provisioned IOPS-month * 1000 IOPS provisioned * 15 days/30). You will be charged for the IOPS provisioned on a volume even when the volume is detached from an instance.

https://aws.amazon.com/ebs/pricing/

B.

http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Storage.html

Provisioned IOPS Storage Costs

Because Provisioned IOPS storage reserves resources for your use, you are charged for the resources whether or not you use them in a given month. When you use Provisioned IOPS storage, you are not charged the monthly Amazon RDS I/O charge. If you prefer to pay only for I/O that you consume, a DB instance that uses magnetic storage may be a better choice. For Amazon RDS pricing information, see the Amazon RDS product page.

B
Volume storage for EBS Provisioned IOPS SSD (io1) volumes is charged by the amount you provision in GB per month, until you release the storage

I have the same idea. B