Which of the following conditions in strands would require them to be discarded?

Pitting at the surface is an important condition that warrants the discarding of strands because it represents a form of localized corrosion that can significantly weaken the integrity of the material. Pitting creates tiny holes or pits on the surface, which can lead to further degradation and failure of the strand under stress. The presence of pits may indicate that the material is no longer structurally sound and could compromise safety and reliability.

In contrast, while rusting, discoloration, and a "funny looking surface" can be indicative of various issues, they may not always reflect an immediate danger to the structural integrity of the strands. Rusting could be superficial and managed, discoloration might not affect performance, and a surface appearing unusual doesn't necessarily mean that the strands can’t still fulfill their intended function. In the case of pitting, however, it is critical to address the condition appropriately, which strongly supports the decision to discard strands exhibiting this phenomenon.