Which of the following is a description of a scaffolding protein?

A) A cellular protein that acts as a chaperone during assembly of a helical capsid.
B) A viral protein that is used on the outside of an icosahedral capsid during assembly.
C) A viral protein used on the inside of an icosahedral capsid during assembly and then removed.
D) A protease that trims the proteins during assembly of an icosahedral capsid.
E) A energy dependent motor used to package the genome into larger icosahedral capsids.