Use the quadratic formula to solve the equation. (Enter your answers as a comma-separated list.) x² + 2x + 17 = 0:
a. -1 + 4i, -1 - 4i
b. -1 + √17i, -1 - √17i
c. -2 + √17i, -2 - √17i
d. 1 + √17i, 1 - √17i