The probability that a student in a university is enrolled in the CS program is $0\mathrm{.}15$; the probability that a student is an international student is $0\mathrm{.}3$; and the probability that an international student enrolled in the CS program is $0\mathrm{.}1.$ What is the probability that A$.$ A student enrolled in the CS program is an international student B$.$ A student who is an international student is enrolled in the CS program C$.$ A student in the university is not an internwtional student or is not enrolled in the CS program