What type of supply plan involves utilizing current resources?

Question $3$Select one:

A$.$

An oil company's investment in new tar sands oil extraction technology.

B$.$

Toronto's plan to extend the subway system.

C$.$

An employee choosing to postpone retirement and remain in the workforce.

D$.$

Improving snow removal services with additional equipment.

E$.$

A business upgrading its technology for more efficient operations.