Answer:
a. in-house software
Explanation:
In-house software is a software that is developed, design, deployed and tested within the organization own IT department. Organisation's IT department has there own Managers, Software Developer, Testers, DevOps (who deployed the solution) within the organisation to create a software that will be use within the organisation.
Why In-House software development needed? Because some organisation has very sensitive data, information and Organisations work structure i.e. Banks. So those organisation don't want there sensitive data to be accessed by any third party company.
