Which of the following projects would be acceptable from a cost-benefit standpoint if the applicable discount rate is 6%? 
Definitions:
Internally Leak
A condition where fluid or gas leaks within a system, such as in an engine or transmission, which may not immediately be visible outside but can affect performance and lead to damage.
Externally Leak
A situation where fluids escape from their intended system through cracks, loose connections, or damaged components, visible on the exterior of the machinery.
Brake Fluid
A type of hydraulic fluid used in brake systems to transfer force into pressure, facilitating the braking process.
Rear Brake Adjustment
The process of modifying the rear brakes of a vehicle to ensure they engage properly and perform optimally.
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