Acelane Inc., unlike its competitors, procures raw material from multiple suppliers. Each supplier in turn supplies raw material to many buyers, including Acelane. This is an example of a$($n$)\_\_\_\_\_\_\_\_$ relationship.

$($N or M in the following refer to many$)$

$1$:$1$

$1$:N

N:M

N:$1$

M:$1$