Which of the following programming languages is defined in IEC61131-3?

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The correct choice is based on the fact that IEC 61131-3 specifically defines a set of programming languages intended for use in industrial automation and control systems. This standard outlines several programming languages specifically designed for programmable logic controllers (PLCs) and includes both Ladder Logic and Function Block Diagram among its specified languages.

Ladder Logic is a graphical programming language that resembles electrical relay logic diagrams and is widely used in industrial control. Function Block Diagram, on the other hand, allows for the creation of complex functions and processes through a visual representation of function blocks, showing the relationships between them with connections that represent signal flow.

The other options do not align with IEC 61131-3. Java and Python are general-purpose programming languages that serve different domains, and C++ and Assembly Language are typically used in software development rather than specific control applications. SQL is a language for managing databases, and HTML is a markup language used for web development, neither of which relates to industrial automation programming standards.