Let U $=\{1,2,3,4,5\},$ B $=\{2,3\}.$ In each part below, what conclusions can be made about A$?$ Specifically, which elements of

U must be elements of A$,$ which elements of U cannot be elements of A$,$ and which elements of U may or may not be

elements of A$?$

a$.$ A $$ B $=\{1,2,3,4\}$

b$.$ A $$ B $=\{2\}$

c$.$ A $$ B $=\{3,4,5$