What is meant by a dedicated computer?

What is meant by a dedicated computer?
A: Which is used by one person only
B: Which is assigned one and only one task
C: Which uses one kind of software
D: Which is meant for application software

A dedicated computer is specifically designed to perform a single function or task continuously. Unlike general-purpose computers that can run multiple applications; these systems are optimized for efficiency; stability; and security in their assigned role. Examples include ATMs; routers; and traffic control systems; where consistency and reliability are more important than flexibility. Because of this specialization; a dedicated computer is highly efficient at its task.