True or false? an app cannot be used on device with different operating system?

A. true

B. false

it is true that an app can not be used on device with different operating system

Explanation:

app cannot be used on device with different operating system is true

because app may may be having different versions that is available for the different operating systems and different platforms

because there are different operating system like Symbian OS, iOS, BlackBerry OS and window etc

so every operating system have have unique language code for which an app is design

so it is true that an app can not be used on device with different operating system