Fill in the blank with the appropriate answer.
When applying field markings per 110.21(B), the field applied marking shall be permanently attached to the equipment or wiring method and shall not be handwritten unless ________________.
A. The penmanship is above average and presented in all caps
B. the color red is used with a white background
C. portions of markings or labels are variable, or could be subject to changes
D. the writing is done w