In a Single- Span Mullion System for a Glass Curtain

In a single- span mullion system for a glass curtain wall,

A) one dead- load anchor is provided at every floor level.
B) two dead- load anchors are provided at every floor level.
C) one dead- load anchor is provided at every alternate floor level.
D) only one dead- load anchor is provided for the entire height of the wall.
E) two dead- load anchors are provided at every alternate floor level.