Let f:A→Bf: A \to Bf:A→B be a function. Which of the following is always true for subsets X1,X2⊆AX_1, X_2 \subseteq AX1,X2⊆A?
f(X1∩X2)=f(X1)∩f(X2)f(X_1 \cap X_2) = f(X_1) \cap f(X_2)f(X1∩X2)=f(X1)∩f(X2)
f(X1∩X2)⊆f(X1)∩f(X2)f(X_1 \cap X_2) \subseteq f(X_1) \cap f(X_2)f(X1∩X2)⊆f(X1)∩f(X2)
f(X1∪X2)=f(X1)∪f(X2)f(X_1 \cup X_2) = f(X_1) \cup f(X_2)f(X1∪X2)=f(X1)∪f(X2)
Both b and c