The correct option is A practitioner who develops both frontend user interfaces and backend services.

This option describes a full stack developer because the role covers both the client side and the server side of an application. Such a developer builds user interfaces, implements server logic and APIs, integrates with data stores, and often works with deployment and testing tools to deliver end to end features.

A person who can consume an entire stack of pancakes is incorrect because it is a humorous phrase and not a description of software engineering skills or responsibilities.

An engineer who focuses on both IPv4 and IPv6 network protocols is incorrect because that definition fits a network engineer. It emphasizes protocol expertise rather than building frontend interfaces and backend services.

A specialist who designs and secures large database systems that serve dual stack applications is incorrect because it describes a database or security specialist. The phrase dual stack usually refers to networking and not to the combined frontend and backend application development that defines a full stack role.

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