Pl HELP ill mark Brainliest to who helps +20 pts

Find the maximum and minimum values of the objective function f(x, y) and for what values of x and y they occur, subject to the given constraints.
f(x, y) = 2x + 6y
x ≥ 0
y ≥ 0
2x + 7y ≤ 70
8x + 4y ≤ 136

a. max at (14,6)=64, min at (0,0)=0
b. max at (15,9)= 84, min at (0,0)=0
c. max at (0,10)=60, min at (0,0)=0
d. max at (17,0)=34, min at (0,0)=0

C. is not the answer