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{ .A } Environment Variable :~:
An environment variable is a user-definable value that can impact the behaviour of running processes on a computer. These variables are part of the environment in which a process runs.
{ .B } System Environment Variables :~:
[ 1. ] These reside at the topmost root of the system and are the same for all processes running on the system under all user profiles.
[ 2. ] Typically set by the operating system or system administrator.
[ 3. ] Common use case: Setting up a PATH variable to a global package/library accessible by all users in the system.
{ .C } User Environment Variables :~:
[ 1. ] Local to a specific user profile in Windows systems.
[ 2. ] Used to store user-specific information, such as paths to locally installed libraries or values specific to programs installed only for certain…