As you're preparing your presentation, you realize you need to justify the man$-$hours that will go into this project. Which of the following is an advantage of developing proprietary software?

a$.$ You can more easily modify the software and add features.

b$.$ The initial cost is lower because the software firm can spread development costs across many customers.

c$.$ An organization might have to pay for features it does not require and will never use.

d$.$ It can take a long time and a significant amount of resources to develop the required features.