Which of the following sets are discrete? check all that apply.
a. {-30,-21,-17,-4,2,3}
b. {1,2,3,4,}
c. {-8,16}
d. {20,80
e. {5,10}

Option (B) and (E) are discrete sets.

Step-by-step explanation:

Discrete Sets include the countable variable. It can be positive real numbers.

Option (A) is incorrect as it also includes negative values.

Option (B) is correct as it includes all natural numbers not included negative or decimal values.

Option (C) is incorrect as it includes -8 and it is negative.

Option (D) is incorrect as it is not the set, Set has both open and closed braces( {a} ).

Option (E) is correct as both elements are positive and not has decimals or negative values.