Find or evaluate the integral by completing the square: ∫(x⁴ - 2x² + 2) dx
a) x⁵ - ²⁄₃x³ + 2x + C
b) ¹⁄₅x⁵ - ²⁄₃x³ + 2x + C
c) ¹⁄₅x⁵ - ²⁄₃x³ + 2x² + C
d) x⁵ - ²⁄₃x³ + x + C