These are add-on features for a variety of mobile devices including smartphones and tablets.
A)Clouds
B)Utilities
C)QR codes
D)Mobile apps

Question

Quizplus · Accepted Answer

Mobile apps are the best choice as they specifically refer to additional software programs that can be downloaded onto mobile devices to provide additional functionality or services. The other choices are not as specific to mobile devices, as clouds can refer to online storage and QR codes are a type of bar code that can be scanned with a mobile device but do not necessarily provide additional features. Utilities are a broad category that can refer to various tools and software programs, not necessarily designed for mobile devices.

These Are Add-On Features for a Variety of Mobile Devices