This is an Introduction to Computer Programming Course (JAVA) question. Please show which ones are incorrect and why. Suppose s1 and s2 are two strings. Which of the following statements or expressions is incorrect? (multiple answers)

This is an Introduction to Computer Programming Course (JAVA) question. Please show which ones are incorrect and why. Suppose s1 and s2 are two strings. Which of the following statements or expressions is incorrect? (multiple answers) A. String s3 = s1 – s2; B. boolean b = s1.compareTo(s2); C. char c = s1[0]; D. char c = s1.charAt(s1.length());

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