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A project manager for a small construction company has a project that was budgeted for $$130,000$ over a six$-$week period. According to the schedule, the project should have cost $$60,000$ to date. However, it has cost $$90,000$ to date. The project is also behind schedule, because the original estimates were not accurate. Who has the primary responsibility to solve this problem?

a$.$ Project Manager

b$.$ Senior management

c$.$ Project sponsor

d$.$ Manager of the project management office