Seven-year-old Tarun is baking cookies for the first time.He does not know what a tablespoon is,so every time the recipe says to use a tablespoon,he uses a teaspoon instead.
Tarun's system of measurement has ________ validity and ________ reliability.

A) low;low
B) high;low
C) high;high
D) low;high

Tarun's system of measurement has low validity because he is not measuring the ingredients as the recipe intends (using a teaspoon instead of a tablespoon). However, it has high reliability because he consistently uses the teaspoon every time the recipe calls for a tablespoon, making his measurements consistent even though they are incorrect.