s an attribute with possible values that have a meaningful order or ranking among them, but the magnitude between successive values is not known.

B is a nominal attribute with only two categories or states: $0$ or $1,$ where $0$ typically means that the attribute is absent$,$ and $1$ means that it is present. Such attributes are referred to as Boolean if the two states correspond to true and false.

C$.$ relates to names. The values of such attributes are symbols or names of things.

Each value represents some kind of category, code, or state, they are also referred to as categorical.

D$.$ is quantitative value; that is$,$ it is a measurable quantity, represented in integer or real values. Such attributes can be interval$-$scaled or ratio$-$scaled.