Alex asks his kids $$ "How do you keep the kid in the front walking at the same pace as Herbie?" His daughter suggests using a drum. What does his son suggest?

Question $3$Select one:

a$.$

Attach a rope between Herbie and the kid at the front

b$.$

Walkie$-$talkies for Herbie and the kid at the front

c$.$

Give Herbie caffeine to speed him up

d$.$

Flashlight signals between Herbie and the kid at the front

e$.$

He also suggests Herbie uses a drum