Answer
a) Merits: Using a particular person's foot is advantageous in that the size does not change and can easily be reproduced in various situations (assuming change with age is not a factor)
Drawbacks: Lacks accessibility and can be destroyed with certain events
b) Merits: Using any person's feet as a standard allows for easy access for any person
Drawbacks: Not reproducible, changes with each person, and can be destroyed
Work Step by Step
We take each situation into account and consider if it is accessible, invariable, indestructible, or reproducible.
a) Merits: Using a particular person's foot is advantageous in that the size does not change and can easily be reproduced in various situations (assuming change with age is not a factor)
Drawbacks: Lacks accessibility and can be destroyed with certain events
b) Merits: Using any person's feet as a standard allows for easy access for any person
Drawbacks: Not reproducible, changes with each person, and can be destroyed
