Interest only loans:

a$)$ allow an investor to pay periodic payments of accrued interest but no principal payments until a loan matures.

b$)$ when loan matures, there is a lump sum payment.

c$)$ are used commonly for $3/5/7/10$ year loans where an investor is looking to earn equity buildup over time and then sell to take that equity and purchase an uplink property.

d$)$ all of the above.

a

b

c

d