The sum of the divisors function \sigma (n) is not a multiplicative function.
true
false

True.

Step-by-step explanation:

If a function is multiplicative then it hold following properties

1.f(1)=1

2. hold for all a and b when  even a and b are not co-prime.

Let is a function of  sum of divisor of n

=Sum of divisor of n

If n=1 then

It is satisfied first property.

Suppose n=9

Then divisor of 9=1,3,9

Sum of divisor=1+3+9=13

Divisor of 3=1,3

Sum of divisors of 3=1+3=4

Hence,

Therefore, is not a multiplicative function.

Hence, given statement is true.

answer: do we write it

step-by-step explanation:

not sure but it may be b, as i said i'm not sure.