Question $13($Mandatory$)(1$ point$)$

One of the disadvantages of proprietary software is that

a$)$ it does not allow the modifications to features needed to counteract a competitor's initiative

b$)$ it is difficult to achieve what is required in terms of features and reports

C$)$ it is hard to control the output even if one is involved in the development of the software

d$)$ it can take a long time and significant resources to develop the required software features