Stuck on putty database backup

[محروم.كوم]

Ok so it's probably not that hard but I just can't get it and not through lack of trying either - but it's starting to drive me crazy now so I need to ask for help

I have downloaded putty to backup my database as it's too big for phpmyadmin anymore ...

open the session no worries with IP and then I run

mysqldump --opt -u user -p dbname > {path}/backup.sql

So lets assume my database is called A
my user in the database is called B
my cpanel password is called C

my user in the database password is called D

am I writing it correctly

mysqldump --opt -u B -pA > backup.sql

is that right??

and then when it comes up asking for a password am I putting in D??

I just seem to be going in circles and confusing myself __DEFINE_LIKE_SHARE__