Write the standard basis for the vector space using (x). (Enter your answers as a comma-separated list.) (P⁵)

a) (1, x, x², x³, x⁴)
b) (x⁴, x³, x², x, 1)
c) (0, 1, x, x², x³)
d) (x, x², x³, x⁴, 1)