Which value is appropriate for a boundary test when a valid input range is 1 to 100 inclusive?

• A. 0
• B. 50
• C. 101
• D. 1

Answer: (D)

Boundary testing looks at values at the edges of a defined range to ensure the system handles the limits correctly. With a valid input range of 1 to 100 inclusive, the smallest allowed value is 1, so testing with 1 checks that the minimum boundary is accepted and that any logic tied to being at the edge (such as inclusive bounds or off-by-one calculations) works properly. The other options don’t stress that edge: 50 is just an inside value, while 0 and 101 are outside the range and would focus on how invalid inputs are rejected rather than how the boundary itself is handled. So, testing with the lower boundary value, 1, is the appropriate boundary test here.