Which indexOf method will be called with the following expression?String str = "abc";System.out.print(str.indexOf('a'));Group of answer choicesint indexOf​(int ch)int indexOf​(String str, int fromIndex)int indexOf​(String str)int indexOf​(int ch, int fromIndex)

Which method in StringBuffer is used to obtain the index within the sequence of the first occurrence of a specified character or substring?a)findFirst()b)indexOf()c)search()d)locate()

Which valueOf method will be called with the following expression?String.valueOf('A')Group of answer choicesstatic String valueOf​(double d)static String valueOf​(char c)static String valueOf​(float f)static String valueOf​(boolean b)

Which of the following list methods returns the index of the first occurrence of a value?Answer areafind()search()index()locate()

Which of the following built-in string methods can be used to find the character at a specific index position?length()charAt()main()toUpperCase()

What's the output of the following code?public static void main(String[] args) { int[] vals = {4, 3, 2, 1}; for (int v : vals) { System.out.println(indexOf(vals, v)); }}public static int indexOf(int[] all, int element) { for (int i = 0; i < all.length; i++) { if (all[i] == element) return i; } return -1;}