Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit. Which summarization will work for all the subnets?

192.168.0.0/23
192.168.0.0/22
192.168.0.0/21
192.168.0.0/20

ccna exploration 2 chapter 6 Exam Question And Answers 

Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit. Which summarization will work for all the subnets?