In Familial Down Syndrome Resulting from Robertsonian Translocation

In familial Down syndrome resulting from Robertsonian translocation,

A) the affected individual has three copies of the long arm of chromosome 14, one of which is attached to chromosome 21.
B) the affected individual is missing a copy of chromosome 21.
C) the affected individual has three copies of the complete chromosome 21.
D) the affected individual has two copies of the long arm of chromosome 21, one of which is attached to part of chromosome 14.
E) the affected individual has three copies of the long arm of chromosome 21, one of which is attached to part of chromosome 14.