Prewritten, commercially available sets of software programs that eliminate the need for a firm to write its own software programs for certain functions, are referred to as .a. software packages. b. mashups. c. outsourced software. d. open-source software.

Option A i.e., software package.

Explanation:

Prewritten, available on the market the software packages, which not necessitate a company's desire to actually compose its software for certain functionalities, will be applied to as software packages.

A software package is essentially a finite number of programs or software components that function together so that they achieve different tasks and objectives.