In fopen(), the open mode “wx” is sometimes preferred “w” because.
1) Use of wx is more efficient.
2) If w is used, old contents of file are erased and a new empty file is created. When wx is used, fopen() returns NULL if file already exists.
(A) Only 1
(B) Only 2
(C) Both 1 and 2
(D) Neither 1 nor 2
Explanation: See https://www.geeksforgeeks.org/fopen-for-an-existing-file-in-write-mode/
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