In a rule-based system, procedural domain knowledge is in the form of:

Solution(By Examveda Team)

Production rules consist of a condition part (also known as the antecedent or left-hand side) and an action part (also known as the consequent or right-hand side). These rules describe the relationships between various entities or conditions in the domain, along with the actions to be taken when certain conditions are met.
Options B, C, and D are not specific forms of procedural domain knowledge in a rule-based system:
Option B: Rule interpreters are software components responsible for interpreting and executing the production rules within the system.
Option C: Meta-rules refer to rules that govern the behavior or interpretation of other rules within the system, rather than representing procedural domain knowledge.
Option D: Control rules are rules that dictate the control flow or behavior of the system, but they do not represent procedural domain knowledge directly.
Therefore, the correct choice for the form of procedural domain knowledge in a rule-based system is Option A: production rules.