Choose all of the items that represent features of smartphone apps. large applications
sold online
available for all major smartphone operating systems
address a specific user need
there are no restrictions on app developers

ITS ON MY QUIZ
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The answer to this question is given in the explanation section.

Explanation:

This question is about to choose all of the items that represent the features of smartphone apps.

large applications  (true) : yes it is a feature of smartphones app that can store large applications, such as PuB G game etc.

sold online (true) : it is a feature of smartphones app, because you can download app online on your smartphone

Available for all major smartphone operating systems(true)  : yes it a feature of smartphones app, for example, one app can be designed for both iPhone, android smartphones.

address a specific user need (true): Yes it addresses a specific user need, for example, a calculator app is designed for accounting users who can use it for calculation large numbers, accounting apps used for accounting users to manage the account. The Uber app is designed for those who want to get a ride when they want etc.

there are no restrictions on app developers (true).

There is no restriction on app developers to develop any kind of app. They are free to develop the app and store it online for others to use it. however, its use is restricted in some countries, for example, some apps are banned in some countries.

answer; i believe the correct answer is layers;