Which of the following statements are correct about the String Class in C#.NET? Two strings can be concatenated by using an expression of the form s3 = s1 + s2; String is a primitive in C#.NET. A string built using StringBuilder Class is Mutable. A string built using String Class is Immutable. Two strings can be concatenated by using an expression of the form s3 = s1&s2;

• A. 1, 2, 5
• B. 2, 4
• C. 1, 3, 4
• D. 3, 5