Answer:
2nd answer
Explanation:
Before finding answer let us get to know about the meanings of words.
sum --> Addition
product --> Multiplication
Accordingly, we have to find the answer with addition & multiplication.
So, the only answer with these two characteristics is 2nd answer.
That is,
1 + 6x
Here, there is a sum between 1 and 6.
And there is a product between 6 and x.