Instantiate a generic class Pair< F, S >

Pair<F, S> is a custom generic class as defined below:

class Pair<F, S> {

 Pair(F f, S s) {
    first = f;
    second = s;
 }

 F getFirst() { return first; }
 S getSecond() { return second; }

 F first;
 S second;
}

We have some statements below that instantiate Pair<F, S>:

A.

Pair<String,Integer> p = new Pair<String,Integer>("N", 100);

B.

Pair<?,Number> p = new Pair<String, Integer>("N", 100);

C.

Pair<String,Number> p = new Pair<>("N", 100);

D.

Pair<?,?> p = new Pair<String,Integer>("N", 100);

E.

Pair<String,?> p = new Pair<>("N", 100);

Select all the valid statements from above that instantiate Pair. Valid here means that compiles successfully.