$2.$ Which of the following is true?

a$.$

ARMs allow borrowers to hedge against rising interest rates.

b$.$

Balloon mortgages end before fully amortizing and have a large payment due at the end.

c$.$

A $5/2$ ARM has an interest rate that adjusts every $5$ years and is fixed for the first $2.$

d$.$

Conventional mortgages are the best option because the interest rate can't increase.