Multiple choice technology web technology What following line of code returns "unhappy".substring(2) a. "un" b. "unh" c. "happy" d. None of the above Reveal answer Fill a bubble to check yourself C Correct answer Explanation String.substring(index) returns characters starting from the specified index to the end. For "unhappy", index 0='u', 1='n', 2='h', so substring(2) returns "happy". Remember that string indexing is zero-based in Java.