A new application for planning journeys on public transport is being developed that will work...

Analysis:

Portability testing evaluates the ease with which software can be transferred from one environment to another. For a mobile application, portability testing ensures that the application functions correctly across different devices and operating systems.

Key Aspect:

C. To evaluate the effectiveness and efficiency in which it can be successfully uninstalled in a specified environment:

This is an aspect of portability testing that checks whether the application can be correctly and completely removed from a device, ensuring no residual data or configuration is left behind. This is critical for mobile applications that need to be installed and uninstalled on various devices.

Explanation of Incorrect Options:

A. To evaluate the degree to which it is easy to operate and control:

This pertains to usability rather than portability.

B. To evaluate the degree to which its components can be used in other systems:

This is related to reusability, not portability.

D. To evaluate the degree to which the system is operational and accessible when required for use:

This relates more to reliability and availability, not specifically portability.

References:

The ISTQB CTAL-TTA syllabus and standard practices in portability testing emphasize the importance of installation and uninstallation processes for ensuring software can be effectively managed across different environments.

Sources:

ISTQB-CTAL-TTA Syllabus

General knowledge on portability testing practices.