What is "Overall Equipment Effectiveness" $($OEE$),$ and what are its three main components?

a$)$ OEE is a financial metric for evaluating return on investment. Its main components are profit margin, revenue growth, and cost reduction.

b$)$ OEE is a measure of how effectively equipment is used in production. Its three main components are Availability, Performance, and Quality.

c$)$ OEE is a marketing metric for assessing campaign success. Its main components are reach, engagement, and conversion rate.

d$)$ OEE is a human resources metric for employee productivity. Its main components are attendance, output, and efficiency.