What is true about functions? I) Functions are objects II) Can be assigned to a variable III) Can be anonymous IV) Return value type has to be defined in a function declaration

What is true about functions? I) Functions are objects II) Can be assigned to a variable III) Can be anonymous IV) Return value type has to be defined in a function declaration

a. I, II, III, IV

b. I, II, III

c. I, II, IV

d. I, II