Answer (a) — incorrect: Although it may seem that passive surveillance is more difficult to carry out because you need to get physicians, hospitals, and laboratories to comply with reporting of disease on a routine basis, it is relatively simple to set up a system where health care workers fill out the necessary reports and submit them to the DOH.

Answer (b) — correct: Active surveillance is more difficult to carry out. Active surveillance is more labor-intensive and costly because the DOH has to hire additional staff who will have to make telephone calls and/or visit the medical facilities.