Which of the following is/areTRUE? I. A field can possess zero divisors. II. Every integral domain is a field. III. The union of two subrings is always a subring IV. Every field is an integral domain. Solution option (iv) is true. becuause if R is a field, then there is no zero divisor in R. Integral domain that is not a field. and the union of two subrings is generally not a subring..