2D DESIGN -External References (Xrefs) Can Be Described as

Multiple Choice

2D DESIGN
-External references (xrefs) can be described as

A) They are the same as blocks and are saved within the drawing file in which they were constructed, but can be inserted into other drawings
B) They are different to blocks in that changes in an original external reference are reflected in the drawing in which the xref is inserted
C) They are blocks which are saved to file names in their own right
D) They are files which refer to parts within a drawing