$3.$ Many college students travel by bike to get around campus, but it can be argued that most bike riders do not wear bicycle helmets. Bicycle helmets reduce the risk of head and brain injuries in the event of a crash. For the following interventions, match them to whether they are a high$-$risk strategy or a population strategy to prevent bike accident related head and brain injuries among college students on campus.

$-$ Flyers posted around campus warning of the dangers of head injury and promoting the use of helmets

$-$ A session during freshman orientation about campus safety that includes messages about wearing a helment when riding a bike

$-$ A required safety training about helmet use for students registrering their bikes on campus

$-$ Provide a pillow case to new residents of residence hall dorm rooms with the message $$Protect

your head when you ride your bike $$ wear a helmet$$

$-$ Offering a discount at the student bookstore that when a student purchases a bike lock, they get

$50\%$ off a bike helmet

$-$ Campus safety identifying bike riders who ride recklessly on campus $($against traffic, on sidewalks, etc$)$ and issue them a citation to attend bike safety training that includes the message to wear a helmet