What is the difference between the String class and the StringBuilder class in the API? Group of answer choices they are in different packages a String can only contain letters while a StringBuilder can contain any character a String is immutable and a StringBuilder is mutable there is no difference A class can directly extend many classes. Group of answer choices True False With this declaration: Student s1; What possible values can s1 hold? Group of answer choices _ a Student object a String the address of a Student object the address of any object
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