Which of the following statement are true? (Select two answers)

Which of the following statement are true? (Select two answers)
A . closing an open file is performed by the closefile ( ) function
B . the second open ( ) argument describes the open mode and defaults to ‘w’
C . if open ( ) ‘s second argument is ‘r’ the file must exist or open will fail
D . if open ( )’s second argument is ‘w’ and the invocation succeeds, the previous file’s content is lost

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Answer: C,D