DSE 2011 Question 39: Misspecification and measurement error

Instead of estimating a production function $y=a_{0}+a_{1}K+a_{2}L+u$ (where $y$ is output, $K$ is capital input and $L$ is labour input), a researcher estimates $y=a_{0}+a_{1}K+u$. It is known that in the true model $a_{2}>0$ and $K$ and $L$ are complements. Which of the following is true?