To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) s1 == s2 - This option is incorrect. The == operator compares the memory addresses of the objects, not their content. Although s1 and s2 have the same content, they are two different String objects with different memory addresses.
Option B) s3 == s1 - This option is incorrect. The new String object created by new String(s1) has a different memory address compared to s1. Therefore, s3 and s1 are not the same object.
Option C) s1.equals(s2) - This option is correct. The equals() method compares the content of the strings. Since s1 and s2 have the same content ("yes"), this expression will evaluate to true.
Option D) s3.equals(s1) - This option is correct. The equals() method compares the content of the strings. Although s3 and s1 are different objects, they have the same content ("yes"). Therefore, this expression will evaluate to true.
The correct answers are A, C, and D. These options are correct because they compare the content of the strings using either the == operator or the equals() method, which yields the expected result.