A firm wants to contract with two suppliers to develop a cellphone tower servicing five million customers. The new technology is required within the next 36 months and has a large budget. The following suppliers are under consideration:

•Supplier A - Has been in business for 20 years; however, every two to three years, its labor force goes on strike

•Supplier B - An established business located in an overseas country which may charge an additional 2% duty on some imported goods

•Supplier C - An established business which has been closed on recent occasions by governing authorities due to health and safety violations

•Supplier D - Has the smallest facilities and workforce of the four, but will be expanding over the next three months and has successfully subcontracted work in order to meet timelines

Based on this information, which two suppliers offer the BEST capacity and capability?