Both B and C are the correct answers.
B. can prevent the spread of disease.
Closure Property. The closure property means that a set is closed for some mathematical operation. ... For example, the set of even natural numbers, [2, 4, 6, 8, . . .], is closed with respect to addition because the sum of any two of them is another even natural number, which is also a member of the set.
Approximately 1 week after antibiotics started and no other symptoms are present.
