Seriously stuck on this:

"Find the LCM of n^3 × t^2 and n × t^4?"
1) n^4 × t^6
2) n^3 × t^6
3) n^3 × t^4
4) n × t^2
Can anyone help?

URGENT! NEED THIS ANSWERED TODAY! ASAP!!
:(
Thanks for your assistance in advance,
NatR