A train, which is $200$ m long, approaches a tunnel, which is $120$ m long. $$The train is moving at a velocity of$0\mathrm{.}87$c$.$

a$.$ What is the length of the train as seen be someone standing at the entrance to the tunnel?

$$m

b$.$ Is the train ever entirely inside the tunnel as seen be the observer at the entrance to the tunnel? $$ONLY $1$ ATTEMPT IS ALLOWED FOR THIS PART.

$---$Select$---$yes$$no

c$.$ What is the length of the tunnel as seen be a passenger on the train?

$$m

d$.$ Is the train ever entirely inside the tunnel as seen by the passenger on the train? $$ONLY $1$ ATTEMPT IS ALLOWED FOR THIS PART.

$---$Select$---$yes$$no