What is the primary function of Fannie Mae and Freddie Mac in the mortgage market?

They originate conforming mortgages and sell them in the secondary market.

They issue government bonds to fund mortgage$-$backed securities$.$

They provide liquidity to the mortgage market by purchasing mortgages from lenders and securitizing

them into MBSs$.$

They offer advances $($secured loans$)$ to their member financial institutions.