Apple introducedRapid Security Response (RSR)to deliver urgent security patches without waiting for a full OS release. When an RSR is applied to iOS, iPadOS, or macOS, Apple adds asingle letter (such as “a”, “b”, or “c”)to the OS version. For example, iPadOS 16.5 (a) indicates an RSR patch has been installed. Apple Learning documents clarify that these patches can later be incorporated into full OS updates, at which point the letter disappears. This simple identifier lets IT admins and users quickly confirm whether a device has received critical security protections.
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