[Configuration]Options and Configurations priority question

[maplestory03]

gallery-dl.conf (in the same directory as said executable)
-c like1.conf -c like2.conf (conf file but not named gallery-dl.conf and more than one)
for example
【gallery-dl -c ./like1.conf -c ./like2.conf url】
what the order of priority from highest to lowest ?

first read the content of gallery-dl.conf and then merge like1.conf?
If there is a duplicate between like1.conf and gallery-dl.conf, will based on latter(like1.conf)
and then merge like2.conf. If there is a duplicate with the previous one, will based on latter(like2.conf)

another question
Is the priority of an option higher whether written before or after - c
for example
【gallery-dl -C ./cookie.txt -c ./like.conf url】 or 【gallery-dl -c ./like.conf -C ./cookie.txt url】or 【gallery-dl -c ./like.conf -C ./cookie.txt -c ./like2.conf url】
these 3 ways will also use cookie.txt instead of like.conf's and like2.conf's cookiefile?

[mikf]

first read the content of gallery-dl.conf and then merge like1.conf?
If there is a duplicate between like1.conf and gallery-dl.conf, will based on latter(like1.conf)
and then merge like2.conf. If there is a duplicate with the previous one, will based on latter(like2.conf)

Yes to all 3.

Is the priority of an option higher whether written before or after - c

Command-line options like -C will always override config file options, regardless of their order.

these 3 ways will also use cookie.txt instead of like.conf's and like2.conf's cookiefile?

Correct.