Which characteristic does not apply to floating$-$point number data types?

Question $46$ options:

a$)$

Floating$-$point numbers are stored in conventional binary format or E notation.

b$)$

Floating$-$point numbers include a decimal point and at least one number after the decimal point.

c$)$

Floating$-$point numbers can be expressed in decimal notation or E notation.

d$)$

Floating$-$point numbers can be positive or negative.