Joey Wants to Upgrade from R75

Joey wants to upgrade from R75.40 to R80 version of Security management. He will use Advanced Upgrade with Database Migration method to achieve this. What is one of the requirements for his success?

A) Size of the /var/log folder of the source machine must be at least 25% of the size of the /var/log directory on the target machine
B) Size of the /var/log folder of the target machine must be at least 25% of the size of the /var/log directory on the source machine
C) Size of the $FWDIR/log folder of the target machine must be at least 30% of the size of the $FWDIR/log directory on the source machine
D) Size of the /var/log folder of the target machine must be at least 25GB or more