Question 6 does not make it clear that it needs the full line and not just the ntp pool in the text doc
what is the name of the fallback NTP pool currently configured for this system? Create the file
/opt/pool.txt
and save the name of that pool there, on a single line.The name of the pool is ntp.ubuntu.com not FallbackNTPServers=ntp.ubuntu.com
Also question 3 on cronab
mon,sat is valid but the only answer accepted is 1,6