Define various annotations that are available in Objective C?

1.	Define various annotations that are available in Objective C?
Answer» Define various annotations that are available in OBJECTIVE C? Below are the four annotations available in objective C (1)Nullable:-Here value can be nil (2)Null unspecified:-This is the default and bridges to a Swift implicitly-unwrapped optional. (3)Non-null:-Here value can not be nill and will bridges to regular REFERENCE. (4)null_resettable:-Here value can not ne nil when we read but we can set it to nil to RESET it.

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