List all numbers from the given set that are:
a) Natural numbers
b) Whole numbers
c) Integers
d) Rational numbers
e) Irrational numbers
f) Real numbers
Set: -4, -4/5, 0, 0.75, √7, 2.8, √81

a) -4, 0, 2.8
b) -4, 0, 2.8, √81
c) -4, 0, √7, √81
d) -4, 0, 0.75, 2.8