If x - y = 8, then which of the following must be true? 1. Both x and y must be positive for any value of x and y.2. If x is positive, y must be negative for any value of x and y.3. If x is negative, y must be positive for any value of x and y. Select the correct answer using the code given below.

• A. 1 only
• B. 2 only
• C. Both 1 and 2
• D. Neither 1 nor 2 nor 3