Question

x^7-2x^6+3x^2-2x+5=0
a.5 complex roots. 1,3,5 real roots. possible rational roots +-1,+-5
b.7 complex roots. 2,4,6 real roots. possible rational roots +-1,+-5
c.7 complex roots. 1,3,5 or 7 real roots. Possible rational roots +-1,+-5
d.5 complex roots. 1,3,5 real roots. Possible rational roots +-3/2,+-1,15