Key concepts of mobile computing are*1 pointMobile CommunicationMobile HardwareMobile SoftwareMobile ChargerAll of the above

The key concepts of mobile computing are:

1. Mobile Communication: This refers to the technology used to transmit data over a wireless network. It includes technologies like 3G, 4G, Wi-Fi, Bluetooth, etc.

2. Mobile Hardware: This refers to the physical components of a mobile device. It includes the device itself (smartphone, tablet, etc.), as well as any peripheral devices (like headphones or a stylus).

3. Mobile Software: This refers to the applications and operating systems that run on mobile devices. It includes everything from the operating system (like iOS or Android) to individual apps (like Facebook or Google Maps).

4. Mobile Charger: While not typically considered a "key concept" of mobile computing in the same way as the others, the mobile charger is certainly an important part of mobile device usage. Without it, the device's battery would run out and the device would be unusable.

5. All of the above: This option is correct if you believe that all of the listed items are key concepts of mobile computing. Given the explanations above, it seems that all of these items (with the possible exception of the mobile charger) could be considered key concepts of mobile computing.