OSFP hello packet intervals is $\_\_\_\_\_\_\_\_\_.($Choose all that apply$)$

Question $29$ options:

Sent every $10$ seconds by default on multi$-$access networks like ethernet and point$-$to$-$point links

Sent every $30$ seconds by default on non$-$broadcast multiple access networks $($NBMA$)$ like Frame Relay

Transmitted to multicast address

Transmitted to unicast address