Which of the following is an example of polynomial in one variable?

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5 + 4 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

Which of the following is an example of polynomial in one variable?

x3yz +xy3z +xyz3+7

x3+y2+1

x3y2+x2y+4

x3+2