1983 55HP Chrysler lower unit oil

[robm40]

Trying to figure out which is drain screw see fill and vent but none says drain is drain right on bottom

 

[wickware]

Drain is the lowest! Please post a Pic. I thought all were marked. Definitely do not pull a mid screw.

 

[robm40]

The two up top are marked fill and vent the bottom one is no it is on the vey bottom by skeg