N f(7)= a let h be the set of all entire functions, then under pointwise addition and multiplication, which of the following is/are true x. the units in h are p

N f(7)= A Let H be the set of all entire functions, then under pointwise addition and multiplication, which of the following is/are true X. the units in H are precisely the no-where vanishing entire functions 2H is integral domain 3. His field 4. All of these