Final answer:
AutoCAD is the widely used software in architecture and engineering for drafting and design, having replaced conventional drafting tools. It enables architects and engineers to create accurate and detailed 3D models and designs more efficiently.
Step-by-step explanation:
The software extensively used in architecture and engineering firms for drafting and design, and that has replaced traditional tools such as T-squares, triangles, paper, and pencils, is B) AutoCAD. This computer-aided design and drafting (CADD) application has revolutionized the way architects and engineers create, visualize, and share their work. Developed initially in 1961, CAD software, like AutoCAD, offers realistic representations, enhanced speed, accuracy, and enables the creation of detailed three-dimensional models. These virtual models can be viewed from different angles, reducing the need for physical mock-ups. In today's architectural and engineering practices, AutoCAD has become an indispensable tool for designing and drawing final plans, contributing to a shift towards a more efficient, precise, and cost-effective approach to construction planning.