Which of the following library function is not case-sensitive?(a) toupper()(b) tolower()(c) isdigit()(d) all of the mentioned

Which of the following library function is not case-sensitive?(a) toup

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1.	Which of the following library function is not case-sensitive?(a) toupper()(b) tolower()(c) isdigit()(d) all of the mentioned
Answer» Right option is (c) isdigit() Best explanation: None.