Final answer:
Cloud computing offers assurance in areas such as availability, capacity, and security levels.
Step-by-step explanation:
The service that specifically offers assurance in areas such as availability, capacity, and security levels is cloud computing. Cloud computing allows users to access and utilize computing resources and services over the internet, providing them with the assurance of availability and capacity. Additionally, cloud computing providers offer security measures to protect data and ensure the privacy and integrity of stored information.