a) Acceptable limits for safety and serviceability requirements before failure occurs
b) Acceptable limits for safety and serviceability requirements after failure occurs

c) Acceptable limits for safety after failure occurs

d) Acceptable limits for serviceability after failure occurs

Answer: a
Explanation: Acceptable limits for safety and serviceability requirements before failure occurs is called limit state. In Limit State design, structures are designed on the basis of safety against failure and are checked for serviceability requirements.