How does security function in cloud computing?

Security in cloud computing primarily focuses on protecting data against unauthorized access. This involves implementing various measures and protocols that ensure only authorized users can access sensitive information stored in the cloud. By safeguarding data, cloud service providers not only protect user privacy but also maintain trust and compliance with regulatory standards. This encompasses encryption, identity and access management, and rigorous authentication processes that are essential in preventing data breaches and ensuring data integrity.

The other aspects mentioned in the choices serve different purposes. While restricting internet usage may manage exposure to threats, it doesn't specifically address how security functions in a cloud environment. Accelerating application development pertains more to efficiency and performance rather than security protocols. Monitoring hardware performance relates to maintaining the infrastructure's health but doesn’t directly correlate with data protection strategies central to cloud security. Thus, focusing on the protection of data against unauthorized access encapsulates the core function of security in cloud computing.