Which of the following concepts refers to a cloud customer paying only for the resources and offerings they use within a cloud environment, and only for the duration that they are consuming them? 

Answer options:

A. Consumable service
B. Measured service
C. Billable service
D. Metered service

B

Measured service is where cloud services are delivered and billed in a metered way, where the cloud customer only pays for those that they actually use, and for the duration of time that they use them.