Q. Fault tolerance system are

• (A) These system runs on a single proce- ssor or an integrated group of processors
• (B) A system where each sub-system can respond to generated events where the events might be generated from other sub-systems or from the environment of the system.
• (C) A system continues in operation after some system faults have manifested themselves.
• (D) A system whose operation is incorrect, if results are not produced according to the timing specifications