Encoding on SOLARIS

[humble_learner]

On a Solaris machine, if LC_LANG is specified as ja and LC_CTYPE = ja, what would be the default encoding n that case ?
Can the encoding be assumed to be UTF-8 or can it be assumed to be eucJP ?

On Solaris machines when the encoding is not explicitly set, how is the default encoding assumed ?

[Codeplug]

http://docs.sun.com/app/docs/doc/816-5165/locale-1
http://docs.sun.com/app/docs/doc/817-2521/6mi67tj3u

What is the output when you run "locale" on the command line?

gg