Superset of Verilog: System Verilog

System Verilog is a hardware description and verification language that is widely used in the field of digital design and verification. It is an extension of the Verilog language and provides additional features and capabilities.

Verilog:
- Verilog is a hardware description language (HDL) that is used to model and design digital systems.
- It is primarily used for designing and simulating digital circuits at various levels of abstraction.
- Verilog is a procedural language, meaning that it allows the description of hardware behavior as a sequence of instructions.
- It is a popular language for digital design and has been widely adopted in the industry.

VHDL:
- VHDL (VHSIC Hardware Description Language) is another hardware description language that is used for modeling and designing digital systems.
- It is a standardized language and is commonly used in the field of electronic design automation (EDA).
- VHDL is a concurrent language, meaning that it allows the description of hardware behavior as a set of concurrent processes.
- It is often used for complex digital designs and has a strong type system and extensive support for verification.

System Verilog:
- System Verilog is an extension of the Verilog language that provides additional features and capabilities for hardware description and verification.
- It combines the features of Verilog with those of VHDL, making it a powerful and versatile language for digital design and verification.
- System Verilog includes features such as object-oriented programming, constrained randomization, and assertions, which are not available in Verilog.
- It also provides enhanced support for verification methodologies such as the Universal Verification Methodology (UVM).

Conclusion:
- While both Verilog and VHDL are widely used hardware description languages, System Verilog is considered a superset of Verilog.
- System Verilog extends the capabilities of Verilog and provides additional features that are useful for digital design and verification.
- Therefore, the correct answer is option 'C': System Verilog.