Due to an explosion at the factory of the company’s preferred supplier, the supplier tells informs the project manager that the ordered items for the project cannot be delivered in time, As these items can be easily replaced other items, the project manager uses the second-best supplier as stated within the risk management plan.This is an example of which of the following?
A、a contingency plan
B、a contingency allowance
C、a workaround
D、a fallback plan