At what age does separation anxiety typically peak in infants and small children?

The sprinkler system operating alarm test valve:

A. may be used to check the water supply. B. is used to simulate actuation of one sprinkler. C. is located in a remote part of the sprinkler system. D. can be used to simulate actuation of the sprinkler system.

Chronic viral hepatitis B with delta-agent is reported with code _____.

Fill in the blank(s) with the appropriate word(s).