which description is correct?

Study the exhibit carefully.

Router R1 is connected to networks 172.16.1.0 /26 and 172.16.1.64 /27. Based on the partial
output in the exhibit, which description is correct?

A.
Router R1 should be reconfigured with an ACL instead of an ip prefix-list command.

B.
Router R1 will advertise both routes.

C.
Router R1 will deny the 172.16.1.0/27 route while permitting the 172.16.1.0/26 route to be
advertised.

D.
Router R1 will deny the 172.16.1.0/26 route while permitting the 172.16.1.64/27 route to be
advertised.

Explanation:
Prefix lists are configured with permit or deny keywords to either permit or deny the prefix based
on the matching condition. A prefix list consists of an IP address and a bit mask. The IP address
can be a classful network, a subnet, or a single host route. The bit mask is entered as a number
from 1 to 32.
Prefix lists are configured to match an exact prefix length or a prefix range. The ge and le
keywords are used to specify a range of the prefix lengths to match, providing more flexible
configuration than can be configured with just the network/length argument. The prefix list is
processed using an exact match when neither ge nor le keyword is entered.
Therefore in this case the exact 172.16.1.0/26 network is permitted while other networks are
denied.
(Reference:
http://www.cisco.com/en/US/docs/ios/12_3t/ip_route/command/reference/ip2_i2gt.html)