What should be put instead of // 1 for the code to compile and execute successfully? Select all that apply.
enum E { a = 0, b = 1 };
void main()
  C<0> c;
  C<a> d = c;  
enum is converted to int, so template<int> is perfectly valid. The opposite is not true, so an error will occur in template< E > when trying to cast int (namely, number 0) to E.

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