Database

Question-1.Consider the following transaction involving two bank accounts x and y-    read(x);    x := x - 50;    write(x);    read(y);    y := y + 50    write(y);
The constraint that the sum of the accounts x and y should remain constant is that of

(A) Atomicity	(B) Consistency
(C) Isolation	(D) Durability

Answer-1.(B)