Final answer:
The spacing between parts affects their strength, appearance, and durability, which is crucial in engineering and manufacturing. Incorrect spacing can compromise the integrity of the finished part.
Step-by-step explanation:
The spacing between the parts being joined greatly affects the strength, appearance, and durability of the finished part. In engineering and manufacturing, proper spacing ensures that the parts fit together as designed, maintaining the structural integrity of the assembly. Inadequate spacing can lead to weak points, an unappealing finish, and may result in the part wearing out more quickly over time. Therefore, the answer to the question is d. All of the above.