You are the project manager for the at-risk CM for a project. In reviewing the project specifications, you note that several specification sections contain performance criteria. You can mitigate the risk using which financial instruments:

a. In addition to normal project insurance requirements, require the trade contractors to provide professional liability insurance 

b. Commercial general liability, umbrella insurance, workman's compensation and automobile insurance in the amount specified for the overall project 

c. There are no additional financial instruments required because the "Designer of Record" is solely responsible for the project design 

d. In addition to normal project insurance requirements, require that the trade contractors provide a performance bond