A Box $B$ Sits in the Back of a Truck $T$ As the Truck Slows Down for a Stop (The Box

Multiple Choice

A box $B$ sits in the back of a truck $T$ as the truck slows down for a stop (the box remains motionless relative to the truck) . What is the appropriate symbol for the horizontal force that the contact interaction between the box and the truck exerts on the truck?

A) $\vec{F}_{N}^{B(T) }$

B) $\vec{F}_{N}^{\mathrm{T}(\mathrm{B}) }$

C) $\vec{F}_{S F}^{B(T) }$

D) $\vec{F}_{S F}^{\mathrm{T}(B) }$

E) $\vec{F}_{K F}^{\mathrm{B}(\mathrm{T}) }$

F) Other (specify)