Given the functions:
i. 3.2 - 3(3t/4)
ii. 7x/10
iii. (t^(-1/4))
iv. sinc [(πf-2π)/5]
v. sinc(2πt/5)
vi. sinc(πt)(t/6)

Match each function to its corresponding letter:

a. i - b, ii - c, iii - d, iv - e, v - f, vi - a
b. i - f, ii - e, iii - d, iv - c, v - b, vi - a
c. i - b, ii - e, iii - a, iv - f, v - c, vi - d
d. i - a, ii - b, iii - c, iv - d, v - e, vi - f