which of the following is always correct?
A. Union of two uncountable set is uncountable
B. The intersection of two uncountable set is uncountable
C. Union of two uncountable set is countable
D. The intersection of two uncountable set is countable
E. Union of an uncountable and countable set is uncountable
F. The intersection of an uncountable and countable set is uncountable
G. Union of a countable and countable set is countable
H. The intersection of a countable and countable set is countable
I. The complement of a countable set is countable.
J. The complement of a countable set is uncountable.