Scenario C$.$ A student was doing research using $2$ variables: blood type $($A$,$ B$,AB,$ and $O)$ and number of times they had a cold during the last year. She wanted to see if there was a significant difference in the frequency of colds among the $4$ blood types. She named her two variables "bloodtype" and "colds."

$6.$ Name the level of measurement $($nominal$,$ ordinal, and scale$)$ for both variables $($blood type and colds$).$