Select the true statement:
a. span of control may be extended beyond 1: 10 in order to ensure that more resources can be deployed on complex, large incidents
b. span of control is less of a factor of concern for incidents that are resolved within the initial operational period
c. span of control should be established without consideration of factors such as the type of incident, nature of the task, hazards, and safety factors
d. span of control is accomplished by organ