Pre-algebra help a couple quick questions ..:)?

[xoxviiiaaxox]

Factor this polynomial using the GCF: 3xy^2 + 3xy^2 - 3xy

3xy(y + x - 1)
-3xy(y + x + 1)
3x(y^2 + x - 1)
3x^2(y^2 + 1 - 1)