Final answer:
Without the necessary context or visual aids, it is impossible to determine conclusively whether RDY and NDA are vertical angles, supplementary, complementary, or form a linear pair. Additional information about the angles or vectors in question is required to provide a precise answer.
Step-by-step explanation:
The question appears to be referencing angles or vectors, which are mathematical concepts. However, the information given is insufficient to determine whether RDY and NDA form a vertical angle, are supplementary, complementary, or form a linear pair without additional context, such as a figure or a clear description of the relationship between RDY and NDA.
For instance, if RDY and NDA are two angles that are formed by two intersecting lines, then they could be vertical angles. If they are adjacent and sum to 180 degrees, they are supplementary. If they sum to 90 degrees, they would be complementary. If they are two adjacent angles that form a straight line, they would form a linear pair. Without visual or descriptive information, it isn't possible to provide a definitive answer.
Since the explanation of options c. and d. does not match the context of the question, it suggests there might be a confusion or typo in the query. Moreover, none of the additional provided information links directly to determining the relationship between angles RDY and NDA.