Which answer is a correct skeleton for a recursive Java method? A. int solution( int N ) { if ( base case ) { return something easily computed } else { divide problem into pieces return something calculated from the solution to each piece } } B. int solution( int N ) { if ( base case ) { return something easily computed } else { return solution(N) } } C. int solution( int N ) { divide problem into pieces return something calculated from the solution to each piece } D. int solution( int N ) { divide problem into pieces if ( base case ) { return something easily computed } else { return something calculated from the solution to each piece } }