A dataset includes the variable "Level of Education," measures participants’ highest educational attainment. Participants in the survey could answer the question by selecting only one of five possible educational levels provided: "Elementary", "High School", "College", "Graduate", "Post Graduate."
What type of variable is "Level of Education"?
Group of answer choices
a. Ordinal, Continuous
b. Nominal, Discrete
c. Categorical, Nominal
d. Categorical, Ordinal