Which of the following statements is correct regarding the following relationship: "A band gives at least one concert and at each concert at least one band plays"?

Select one:

This is a C:N relationship, which is a variant of the $1$:$N$ relationship.

It is a relationship that cannot be represented by Chen notation.

This is an N:CM relationship, which is a variant of the N:M relationship.

This is an N:M relationship.