Which set of values identified by applying boundary value analysis is most likely relevant?

Boundary value analysis is a testing technique that focuses on the values at the boundaries rather than those within the range. This method is based on the observation that errors often occur at the edges of input ranges.

The set of values that best represents boundary value analysis typically includes the exact boundary values as well as values that are immediately adjacent to these boundaries. For example, if the valid range of input is between 50 and 60, then the boundary values would be 50 and 60, with 49 and 61 being the values just outside these boundaries.

The chosen set consists of values that are closely aligned with these principles. It includes the boundaries—50 and 60—along with the values directly above and below them—51, 55, 56, and 61. This comprehensive inclusion ensures that tests are performed not only at the edges but also just outside these critical points, capturing any potential boundary-related errors that could occur in the system.

Therefore, this set effectively covers the boundaries and the adjacent values, making it the most relevant when applying boundary value analysis. The other options do not fully encapsulate this critical aspect of evaluating potential risk areas in the input range.