Give all possible rational zeros for the following polynomial. P(x)=2x³+5x²+8x-8
1) +-1,+-2,+-4,+-8
2) +-1,+-(1)/(2),+-(1)/(4),+-(1)/(8),+-2
3) +-1,+-2,+-4
4) +-1,+-(1)/(2),+-2,+-4,+-8