NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Consider the bipartite graph Km$,$n$.$

Find the values of m and n if Km$,$n has an Euler circuit.

Multiple Choice

Km$,$n

has an Euler circuit when m is even, n is odd, and m$,$ n $>0.$

It can never have an Euler circuit.

Km$,$n

has an Euler circuit when both m and n are odd and m$,$ n $>0.$

Km$,$n

has an Euler circuit when both m and n are even and m$,$ n $>0.$