Final answer:
Android-based smartphones are distinguished by their open-source Software Development Kit (SDK). This characteristic signifies that the Android operating system's SDK is accessible to developers, allowing them to modify, enhance, and create applications for the platform. The open nature of the SDK fosters a collaborative and dynamic ecosystem, contributing to the diverse range of apps available on Android devices. The correct answer is D. Open source SDK.
Step-by-step explanation:
Android-based smartphones are distinguished by a defining feature— an Open Source Software Development Kit (SDK).
An SDK comprises tools and libraries enabling developers to create applications tailored for a specific platform. The noteworthy aspect of the Android SDK lies in its open-source nature.
This implies free accessibility and modifiability by anyone, fostering extensive customization and development possibilities.
The open-source framework encourages collaboration, innovation, and a diverse array of applications for the Android platform.
The accessibility and adaptability of the Android SDK underscore the platform's commitment to inclusivity and flexibility, promoting a vibrant and dynamic ecosystem for mobile application development.
Therefore, the correct answer is D. Open source SDK.