Android assigns a unique Linux UID to each installed app. What direct security benefit does this provide?

• A.It stops the app reaching the network, because every socket call is refused unless the uid appears in the inet group, and all outbound traffic is dropped by the kernel otherwise
• B.It reserves a dedicated CPU core for the app, because the scheduler pins each uid to a core at launch, and all of its threads therefore run without contention from other packages
• C.The Linux kernel enforces file and process access controls based on UID, so apps cannot read each other's data directory without explicitly sharing via IPC
• D.It lets the app open another package's files for debugging, because the platform treats a shared uid as a debugging aid, and every app signed by one developer lands in the same identity