Jim is a building contractor. Bob is a builder who works for Jim under a contract of service. Bob is currently engaged in the building works of a multi-storey building, which Jim undertook to erect. Dave is a truck-driver who agreed to provide services to Jim for this particular construction work. Although it is Jim’s responsibility to instruct Dave as to what work needs to be done, Dave is responsible for providing his own machinery and his own assistants. (a) While Bob was working on the multi-storey building, the scaffolding on which he was standing collapsed and Bob fell on the ground. Bob was not wearing the protective helmet, which had been provided by Jim to all the builders. Bob suffered a serious head injury. (b) While Dave was working at the building site, he negtly left one of his trucks switched on and unattended. The truck rolled away from the building site and smashed into Alice’s house, which was right across the street. Alice’s house suffered extensive damage. Required: Advise Jim as to his legal liability in respect of (a) and (b) above. (10 marks)