When united parcel service (ups) is looking for crews to fly its giant 747 cargo aircraft, it wants to hire the very best people to whom to entrust its extremely expensive equipment. therefore, it looks for
a. only applicants from internal sources.
b. only applicants from external sources.
c. many more applicants than there are positions to be filled.
d. a very small number of applicants to reduce the time and costs required to examine the complex credentials of a larger number of applicants.
e. only pilots laid off from passenger carriers?