calling a inherited over-ridding function

In my programming class today we started touching onto class inheritance, and the professor posed a question he couldn't answer off the top of his head.

In a hierarchical chain of classes where each one extends the previous, and overrides the same function lets say foo(), how would you call a foo from several steps up the chain, were super.foo() would only call 1 above.


Code:
---------
class A
{
foo(){}
}

class B extends A
{
foo(){}
}

class C extends B
{
foo(){}
}

class D extends C
{
foo(){}
}

D obj = new D();
---------
How could obj call foo defined in B or A?

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