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Write C statements which tests to see if input_file has opened the data file successfully. If not, print an error message and exit the program.

A.	Test 1 if( input_file == NULL ) { printf("Unable to open file.\n");\ exit(1); }	B.	Test 2 if( input_file != NULL ) { printf("Unable to open file.\n");\ exit(1); }
C.	Test 3 while( input_file = NULL ) { printf("Unable to open file.\n");\ exit(1); }	D.	Cannot be determined

Answer and Explanation

Answer:Test 1
if( input_file == NULL ) {
printf("Unable to open file.\n");\
exit(1);
}

Explanation:
There is no explanation...

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