The vector that is normal to the surface 2xz2 - 3xy - 4x = 7 at the point (1, -1, 2) is

• A. 2i - 3j + 8k
• B. 2i + 3j + 4k
• C. 7i - 3j + 8k
• D. 7i - 5j + 8k