✪ Choose the correct option.
Which of these are valid declarations?
(i) union {
int i;
int j;
};
(ii) union u_tag {
int i;
int j;
};
(iii) union {
int i;
int j;
FILE k;
};
(iv) union {
int i;
int j;
}u;
(i) union {
int i;
int j;
};
(ii) union u_tag {
int i;
int j;
};
(iii) union {
int i;
int j;
FILE k;
};
(iv) union {
int i;
int j;
}u;