Aiden calculated the area of triangle QRS below by finding half the product of 1.5 and 1.1.

Triangle Q R S has a base of 5.4 and a height of 1.1. Another side has a length of 1.5.

What error did Aiden make?
Aiden should have found half the product of 1.1 and 1.2 because the 1.5 line is not a dotted line in the figure.
Aiden should have found half the product of 1.1 and 5.4 because the 1.5 line is not perpendicular to the 1.1 line.
Aiden should have found half the product of 1.5 and 1.2 because the 1.1 line is not perpendicular to the 1.5 line.
Aiden should have found half the product of 1.5 and 5.4 because the 1.1 line is a dotted line and not part of the figure.