Strings vs classes when both are reference types

Question

Here is how my last interview went:

Question: Where are strings stored?

Answer: Heap since it is a reference type

Answer 1

The command one = ... sets the *pointer named one to a new value. Since two is a different pointer, it retains it's original value.

The command one.someString = ... modifies the object referred by one. two is still a different pointer, but since it points to the same object, the modifications are shared between them.