Step 1: Understanding the terms.
- Rule: A rule is a directive or regulation that states a specific action or behavior must be followed. It defines what is to be done or not done.
- Policy: A policy refers to a set of guiding principles or frameworks, which help in decision-making but does not always specify actions as precisely as a rule.
- Strategy: A strategy is a plan or method designed to achieve specific objectives but is more general in nature compared to a rule.
- Procedure: A procedure describes a sequence of actions to be taken to accomplish a task, but it may not specify the decision to take or not take an action.
Step 2: Analyzing the options.
- Rule fits the description of a specific and definite action to be taken or not taken.
- Policy, Strategy, and Procedure do not define the specific actions in the same manner as a rule.
Final Answer:
\[
\boxed{\text{The correct answer is (1) Rule.}}
\]