What would be the best summary route for the following networks?

ccna-vlans
ccna2-answer
ccna2-exam

#1

What would be the best summary route for the following networks?

10.50.168.0/23
10.50.170.0/23
10.50.172.0/23
10.50.174.0/2410.50.160.0/22
10.50.164.0/23
10.50.168.0/16
10.50.168.0/21*
10.50.168.0/22
10.50.168.0/23