Why is slack important to the project manager? O because it represents the degree of flexibility the project manager will have in rearranging work and resources. A project network with several near critical paths and hence, little slack, gives the project manager little flexibility in changing resources or rearranging work. O because it represents the degree of rigidity the project manager will have in work and resources. A project network with several near critical paths and hence, lots of slack, gives the project manager no flexibility in changing resources or rearranging work. O because it represents the degree of time the project manager will have in work and resources. O because it represents the degree of time and cost the project manager will have in work and resources