A manager in your company wants to standardize all mobile device applications across different operating systems. Some users have Android mobile devices, some users have iOS devices, and some users have Windows Mobile devices. How can you best answer the manager in regard to his request?
a. The manager must settle on using a single mobile operating system.
b. No apps will run on all operating systems.
c. All mobile apps will run on all mobile operating systems.
d. Some apps will work on different OS platforms, but many will not.

The correct answer is letter "D": Some apps will work on different OS platforms, but many will not.

Explanation:

Devices using Android, iOS, and Windows Mobile Operating Systems (OS) use dedicated apps for each OS. OS providers reserve some of their key apps to the exclusive use of their devices which makes them different one from another and creates users having a bias on certain OS.  

Thus, if the manager of a company is looking for standardizing all mobile applications across different OS, that is unlikely to be possible since some apps are compatible while others are not.