Point out the correct statement

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Point out the correct statement?

A. POSIX represents a portable operating system interface, primarily for UNIX systems

B. There are different levels of indication that can be used, ranging from mere notification to fatal error

C. The default input format for POSIX dates consists of the month, followed by the year and day, separated by slashes or dashes

D. R don't have any way to indicate to you that something's not right

Answer: Option A

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