String Methods in Java: Identifying the Incorrect Statement

Which of the following statements is not correct about the methods of the String class in Java?

• OA lastIndexOf(char) returns the index of the specified character occurring last in the string. If the character is not found, the method returns -1.
• OB concat() concatenates the specified string to the end of the string object.
• OC trim() removes whitespace from both ends of a string object and returns the trimmed string.
• OD The statement 'OD' is missing, so it cannot be determined whether it is correct or incorrect.