Which one of the following statements is correct for DEA model?

Question $3$Answer

a$.$

DEA is used to measure the relative efficiency of two $($or more$)$ units in different industries, such as a bank and a school.

b$.$

If the inputs of the composite unit in DEA are greater than the inputs for an individual unit, then the composite is more efficient.

c$.$

It is possible for a single DEA programming model to identify all operating units are inefficient.

d$.$

None of the above