[Rails] How to create carbon copy recipents (cc) in Action Mailer for rails version 2.3.8

My application is devloped in rails -2.3.8

i able to send mail to a single recipent.

recipients 'ssasidaran86@gmail.com'

from @admin_name
subject sub
body :cid => @cid, :name => user_detail.name , :addressing =>
@addressing , :admin_email => @admin_email, :admin_name => @admin_name
content_type "text/html"

how to cc recipents in rails -2.3.8

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