Final answer:
A polynomial in standard form has its terms ordered by descending degree. The polynomial 12x5 - 6x2 - 9x + 12 is written in standard form.
Step-by-step explanation:
The student asked which polynomial is in standard form.
A polynomial is in standard form when its terms are written in descending order of their degrees.
The correct answer is 12x5 - 6x2 - 9x + 12, where the degrees of the terms are in descending order from 5 to 0, which fulfills the criteria for standard form.