Which statement is true regarding the password-recovery process?
A.
You must have a console connection
B.
You cannot set the console port to an insecure mode
C.
You must press the Enter key so that you can boot into single-user mode
D.
When prompted to enter the full pah name of the shell you must press the Enter key
A is the correct one!
http://www.juniper.net/documentation/en_US/junos12.1/topics/task/configuration/authentication-root-password-recovering.html
You need console access to recover the root password.