Which two modifications enable the code to compile?

Given:

Which two modifications enable the code to compile?
A. At line 1, remove abstract
B. At line 9, insert super ( );
C. At line 12, remove public
D. At line 17, insert super (x);
E. At line 17, insert super (); super.side = x;
F. At line 20, use public void area ( ) {

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