function tolower(c) defined in library <ctype.h> works for ___________

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Question:function tolower(c) defined in library <ctype.h> works for ___________

1.Ascii character set

2.Unicode character set

3.Ascii and utf-8 but not EBCDIC character set

4.Any character set

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  1. function tolower(c) defined in library <ctype.h> works for ___________
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