During an attempt to ’scp’ between two hosts， an error indicating PRNG is not seeded is displayed.What is the likely cause of the error？（）  

• A、The sshd user id is locked.
• B、The /var/empty directory needs to be created.
• C、PRNG is set to ’no’ in the /etc/ssh/sshd_config file.
• D、The permissions on /dev/random and /dev/urandom are incorrect.