What is the name of a standard unit of software that packages code and all its dependencies?

• A. A container
• B. A virtual machine
• C. A library
• D. A module

Answer: (A)

Containers provide a portable, isolated unit that packages code and all its dependencies. A container wraps the application with the exact libraries, runtime, and configuration it needs, creating an image that can run the same way on any host equipped with a container engine. This ensures consistency across development, test, and production environments and keeps the runtime lightweight by sharing the host's kernel rather than shipping a full operating system.

A virtual machine also bundles software and dependencies, but it includes a complete guest OS, making it heavier to boot and manage. Libraries or modules are merely pieces of code or functionality and don’t by themselves guarantee a self-contained, portable runtime.