Final answer:
The practice not recommended when conducting exercises is completing a full-scale multiagency coordination exercise before defining the objective of a tabletop exercise. Training participants beforehand, regularly conducting exercises, and varying conditions are other best practices. Therefore correct option is A
Step-by-step explanation:
When conducting exercises, there are several best practices that ensure the effectiveness of the training and the safety and preparation of all participants. However, one practice mentioned is not recommended: a. completing a full-scale exercise to test multiagency coordination before determining the objective of a tabletop exercise. This approach is not efficient as it puts resources into a large-scale exercise without first identifying key objectives and goals with smaller, more focused exercises like tabletop scenarios.
Other best practices for conducting exercises include b. training all participants in the procedures before conducting drills, c. conducting exercises at least annually, and whenever there are updates to procedures, and d. varying the conditions under which exercises are conducted to prepare for different scenarios.