A, B, and D.
Choices A, B, and D would not be recommended.
Choice A is correct because recreating a roof feature that actually existed at one time but is now missing from the building would be recommended; however, recreating one that was never built (even if it was part of the original design) would NOT be recommended in a restoration project.
Choice B is correct because conditions such as peeling paint, broken glass, stuck sashes, or high air infiltration do not necessarily mean the windows are beyond repair and need to be automatically replaced. An in-depth assessment of the existing windows early in the planning process is recommended so that conditions can be noted and all options explored.
Choice D is correct because traditional repointing methods are “Recommended” rather than “surface grouting” or “scrub” coating techniques such as “sack rub” or “mortar washing”.
Choice C is incorrect because removal of a door surround feature from a later historic period despite its perfect overall condition and appearance would actually be classified as a “recommended” action, since features from other historic periods can confuse the depiction of the building’s appearance from the restoration period.
To learn more about historic preservation, you can read through the Secretary of the Interior’s Standards for the Treatment of Historic Properties.