What are commonly shown on all drawings to provide basic information like general references and tasks?

The correct answer is general notes. These notes are essential components of construction drawings, as they provide vital information related to the project that isn't necessarily depicted in graphical form. General notes can include instructions, materials required, references to codes and standards, and specific guidelines for the execution of tasks. They serve as a quick reference for contractors and workers to understand the broader context of the drawings, ensuring that all parties are aligned on expectations and requirements.

While construction details depict the specific components and how they fit together, project specifications outline the technical requirements and standards for materials and workmanship. Design guidelines, on the other hand, provide overarching design philosophies or requirements but are typically not detailed on every drawing. General notes, therefore, play a crucial role in conveying overarching tasks and references concisely and clearly, making them indispensable in the construction documentation process.