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

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

1.	1 : typedef long a;extern int a c; 2 : typedef long a;extern a int c; 3 : typedef long a;extern a c;
A.	1 correct
B.	2 correct
C.	3 correct
D.	1, 2, 3 are correct
Answer» D. 1, 2, 3 are correct