You have the following idea. You will develop a messaging app that will send and receive messages from a host of messaging apps like iMessage, Viber, Signal, Telegram, Skype and others. This way users will have to use only one app and not many to access all their messages. Your friend argues that this may not be easy. Check the following arguments $($more than one may be correct$)$ that apply for anyone that would like to build such an app.

You have the following idea. You will develop a messaging app that will send and receive messages from a host of messaging apps like iMessage, Viber, Signal, Telegram, Skype and others. This way users will have to use only one app and not many to access all their messages. Your friend argues that this may not be easy. Check the following arguments $($more than one may be correct$)$ that apply for anyone that would like to build such an app.

Each app uses a different encryption$/$decryption algorithms

All apps use open protocols such as HTTP

All apps use closed prototols you don't have access to$.$ As a result your message client will not be able to log in to any of the app servers

All apps encode audio the same way, using $44$ thousand samples per second and two channels

All apps encode video the same way, using variable bit rate and HD $(2$K$)$ quality