Heng Heng Contractor (HHC) was contracted to construct a swimming pool byan owner of a bungalow. An unexploded bomb was discovered by HHC during excavation works. The police stopped all the work for one month. The Architectordered HHC to protect the works, fill up areas affected by the bomb squad'sexcavation,redesign thefoundation,causing furtherdelaytothework.

a) Explainthedifferencesbetweenanominatedsub-contractorandadesignatedsub-contractor.