Students were asked to write [tex]6x^5 + 8x - 3x^3 + 7x^7[/tex] in standard form. Shown below are four student responses:

Anne: [tex]7x^7 + 6x^5 - 3x^3 + 8x[/tex]
Bob: [tex]-3x^3 + 6x^5 + 7x^7 + 8x[/tex]
Carrie: [tex]8x + 7x^7 + 6x^5 - 3x^3[/tex]
Dylan: [tex]8x - 3x^3 + 6x^5 + 7x^7[/tex]

Which student is correct?