What type of physical security control is shown here?

An illustration shows a rectangle with $2$ doors, one on the left side, labeled Door $1,$ and the other on the right side, labeled Door $2.$ A Secure Area is represented by a dashed rectangle adjacent to the first rectangle on the right side. A downward curving arrow points from Door $1$ to the area inside the first rectangle. Another downward curving arrow points from Door $2$ to the Secure Area.

Group of answer choices

A$.$ A Faraday cage

B$.$ A mantrap

C$.$ A bollard

D$.$ An air gap