Which of the following is an example of secondary evidence?

Secondary evidence refers to evidence that is not original or primary but is used to support a claim about the original evidence. In this context, a copy of a deed or document serves as a representation of the original deed, making it a form of secondary evidence. This situation often arises in legal cases where the original document is not available, and a copy can provide necessary information about the contents or existence of the original.

In contrast, a witness observing a deed signing is an example of primary evidence since it involves firsthand knowledge. A written affidavit establishes facts based on personal knowledge but does not itself constitute the original document, thus not qualifying as secondary evidence. A contract draft, while it may hold value in legal contexts, typically represents an intention rather than the final, executed document, and is also not classified as secondary evidence. Therefore, a copy of a deed or document is the clear example of secondary evidence among the provided choices.