The Major Difference Between a Registry and a Surveillance System

Multiple Choice

The major difference between a registry and a surveillance system is

A) A registry collects population-based data for each case, while a surveillance system may or may not collect population-based data.
B) A registry may or may not collect population-based data, while a surveillance system only collects population-based data.
C) Both a registry and a surveillance system collect only population-based data.
D) Both b and c