What is the sum of 1.57 and 6.88?

7 tenths, 3 hundredths, and 5 thousandths
8 ones, 4 tenths, and 5 hundredths
5 ones, 4 tenths, and 8 hundredths
7 tenths, 4 hundredths, and 5 thousandths

The sum of 1.57 and 6.88 is 8.45.