Câu 17: 70-483: MCSD Programming in C

You need to write a method that combines an unknown number of strings. The solution must minimize the amount of memory used by the method when the method executes. What should you include in the code?

1. A. The String.Concat method — đáp án hiện tại
2. B. The StringBuilder.Append method
3. C. The + operator
4. D. The += operator