Operations research tools: identify a linear programming (LP) software package known historically for solving large-scale LP problems.

Introduction / Context:
Linear programming (LP) is a fundamental technique in operations research for optimizing an objective subject to linear constraints. Over the years, various software packages—commercial, academic, and government—have implemented simplex and interior-point methods suitable for large-scale problems. The question asks you to pick one LP-specific package from the given list.

Given Data / Assumptions:

• We look for software with “LP” focus in name and functionality.
• Large-scale context implies efficient algorithms and numerics.
• Options include names with varied domains; only one clearly references LP.

Concept / Approach:
Packages historically tailored to LP often include “LP” in their product names (for example, PDQ/LP, LINDO, CPLEX). Among the options, PDQ/LP explicitly denotes a linear programming tool. The other names could refer to different modeling or simulation tools and do not unambiguously indicate LP specialization from the stem alone.

Step-by-Step Solution:

Verification / Alternative check:
Historical OR/MS references and course syllabi list LP-oriented packages; names featuring “LP” typically indicate linear programming functionality.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming every unfamiliar software name is LP-capable; always match the domain indicated by naming and context.

Final Answer:
PDQ/LP