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What line of code is missing from this method?

private static int size(XMLTree t) {
int totalNodes = 1;
[------------------------] // missing line
for (int i = 0; i < t.numberOfChildren( ); i++) {
totalNodes += size( (i));
}
}
return totalNodes;
}
1) if (t.numberOfChildren( ) > 0) {
2) if (! ( ).equals("")) {
3) if (!t.isTag( )) {
4) if (t.isTag( )) {

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