Let f be a twice differentiable function on (1,6). If f(2)=8, f'(2)=5, f'(x) is greater

Let f be a twice differentiable function on (1,6). If f(2)=8, f'(2)=5, f'(x) is greater than or equal to 1 and f"(x) is greater than or equal to 4, for all x€ (1,6), then:
A. f(5) is less than or equal to 10
B. f(5)+f'(5) is greater than or equal to 28
C. f(5)+f'(5) is less than or equal to 26
D. f'(5)+f''(5) is less than or equal to 20