Role of testbench scenarios in HDL simulation: When simulating an HDL design, the engineer must craft representative input scenarios (testbench stimuli) and must know the correct expected responses to verify behavior. Assess this statement.

Introduction / Context:
Simulation is the first line of defense against design bugs in HDL projects. A design without a robust testbench can appear to function yet conceal corner-case failures that only emerge in hardware, when fixes are more expensive.

Given Data / Assumptions:

• A testbench applies input vectors, clocks, resets, and sequences to the Device Under Test (DUT).
• Expected outputs or assertions define pass/fail criteria.
• Coverage (code/functional) indicates how thoroughly scenarios exercise the design.

Concept / Approach:
Creating scenarios means modeling normal, boundary, and error conditions. Knowing the proper response allows the use of self-checking mechanisms (assertions, scoreboards) so that simulations fail automatically when behavior deviates from the specification.

Step-by-Step Solution:

Verification / Alternative check:
Industry best practices (UVM, constrained random testing) formalize this approach; regressions rely on known expected results to guard against regressions after code changes.

Why Other Options Are Wrong:

Common Pitfalls:
Overlooking reset/initialization conditions; failing to simulate worst-case timing; not creating self-checking tests leading to subjective pass/fail judgments.

Final Answer:
Correct