What is true about the sum of the two polynomials?

6s2t – 2st2

4s2t – 3st2

The sum is a binomial with a degree of 2.
The sum is a binomial with a degree of 3.
The sum is a trinomial with a degree of 2.
The sum is a trinomial with a degree of 3.

The sum is a trinomial with a degree of 2.