N JAVA Which XXX tests the input value 4 for squareNum()?   public static int squareNum(int origNum) { return origNum * origNum; } public static void main(String args[]) { System.out.println("Testing started"); XXX; System.out.println("Testing completed"); }   A. test(4) B. squareNum(4) C. assert(test(4)==16) : "4, expecting 16, got: " + test(4); D. assert(squareNum(4)==16) : "4, expecting 16, got: " + squareNum(4);

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