What values of x guarantee that f(x) = x^3 is within 0.05 unit of 8?

Select one:

a. If x is within 0.01 unit distance of 2, then f(x) is within 0.05 unit of 8.

b. If x is within 2 units distance of 2, then f(x) is within 0.05 unit of 8.

c. If x is within 1.99 units distance of 2, then f(x) is within 0.05 unit of 8.

d. If x is within 2.01 units distance of 2, then f(x) is within 0.05 unit of 8.