SR 3.6 Assume s1, s2, and 33 are String variables initialized to Amanda, Bobby, and Chris,...

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SR 3.6 Assume s1, s2, and 33 are String variables initialized to "Amanda", "Bobby", and "Chris", respectively. Which String variable or variables are changed by each of the following statements? a. System.out.println(s1); b. sis3.toLowerCase(); C. System.out.println(s2.replace('B', 'M')); d. s3s2.concat(s1);