A network administrator enters the service password-encryption command into the configuration mode of a router. What does this command accomplish?

 A network administrator enters the service password-encryption command into the configuration mode of a router. What does this command accomplish?

• This command encrypts passwords as they are transmitted across serial WAN links.
• This command prevents someone from viewing the running configuration passwords.
• This command automatically encrypts passwords in configuration files that are currently stored in NVRAM.
• This command enables a strong encryption algorithm for the enable secret password command.
• This command provides an exclusive encrypted password for external service personnel who are required to do router maintenance.
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