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1 : typedef long a; extern int a c; 2 : typedef long a; extern a int c; 3 : typedef long a; extern a c;

Correct Answer: 3 correct

Explanation:

typedef long a;
extern int a c;
while compiling this statement becomes extern int long c;. This will result in to "Declaration syntax error".


typedef long a;
extern a int c;
while compiling this statement becomes extern long int c;. This will result in to "Too many types in declaration error".


typedef long a;
extern a c;
while compiling this statement becomes extern long c;. This is a valid c declaration statement. It says variable c is long data type and defined in some other file or module.


So, Option C is the correct answer.


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