As a contractor employing trade construction trade workers and having to deal with potential labour problems on the construction site located in a militant labour environment. Your company bid, won and now are working on a cost plus (cost reimbursable) contract. Suddenly, during the project' execution phase, the Owner decided that he would like to expand the Scope of Work (SOW) and change the current cost plus contract arrangement to a firm-fixed priced (lump sum) one. Which of the following contractual option, as project manager of this project for your company taking into account labour relations risks, should be included as part of your contractual negotiation strategy: a. All of the above. b. Complete the original scope of work and reject the additional work. c. Negotiate the fix-price (lump sum) contract that includes both the additional work and the remaining work to complete. d. Complete the original scope of work on a cost reimbursable basis and negotiate a contract for the additional scope of work