In Canada,public Sector Services Such as National Defence Are

In Canada,public sector services such as national defence are

A) exclusively produced by public servants and by public firms.
B) exclusively produced by private firms.
C) exclusively contracted out to other public departments.
D) provided by government,but some other public sector services may be sub-contracted to private firms for production.
E) provided by the private sector,but are sub-contracted to the public sector for production.