Which of the following statements are correct about the String Class in C#.NET? 1.Two strings can be concatenated by using an expression of the form s3 = s1 s2; 2.String is a primitive in C#.NET. 3.A string built using StringBuilde

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