Superscalar architecture is a type of microprocessor design that allows multiple instructions to be executed in parallel. It is designed to improve the overall performance of the processor by exploiting instruction-level parallelism. Among the given options, the Pentium 4 is an example of a superscalar architecture.

Here's a detailed explanation of why the Pentium 4 is a superscalar architecture:

1. Superscalar Architecture:
- Superscalar architecture allows the processor to execute multiple instructions in parallel by employing multiple execution units.
- It achieves this by analyzing the dependencies and data availability of instructions and scheduling them for execution simultaneously, as long as there are no dependencies.
- This helps to utilize the available resources efficiently and improve the overall performance of the processor.

2. Pentium 4:
- The Pentium 4 is a microprocessor developed by Intel and was released in 2000.
- It was designed with a focus on high clock speeds and improved performance for multimedia applications.
- The Pentium 4 architecture incorporates several features that make it a superscalar design.

3. Multiple Execution Units:
- The Pentium 4 has multiple execution units, including multiple ALUs (Arithmetic Logic Units) and multiple FPUs (Floating-Point Units).
- These execution units can operate in parallel, allowing multiple instructions to be executed simultaneously.

4. Out-of-Order Execution:
- The Pentium 4 supports out-of-order execution, which means it can rearrange the order of instructions to maximize parallelism and improve performance.
- It analyzes the dependencies between instructions and executes them in an order that minimizes stalls and resource conflicts.

5. Instruction Level Parallelism:
- The Pentium 4 architecture also incorporates techniques to exploit instruction-level parallelism.
- It can decode and issue multiple instructions per clock cycle, allowing for more efficient utilization of the execution units.

6. Branch Prediction:
- The Pentium 4 includes advanced branch prediction mechanisms that help reduce the impact of branch instructions on performance.
- It predicts the outcome of conditional branches and speculatively executes instructions based on those predictions, improving the overall instruction throughput.

In conclusion, the Pentium 4 is an example of a superscalar architecture due to its multiple execution units, out-of-order execution capabilities, support for instruction level parallelism, and advanced branch prediction mechanisms. These features enable the processor to execute multiple instructions in parallel and improve overall performance.