Julian fully simplifies this polynomial and then writes it in standard form.

4x2y2 – 2y4 – 8xy3 + 9x3y + 6y4 – 2xy3 – 3x4 + x2y2
If Julian wrote the last term as –3x4, which must be the first term of his polynomial in standard form?

4y4
6y4
–2xy3
–10xy3