What does mean the 'also' keyword in the request statement of dhclient-ethX.conf?

Solution Unverified - Updated -

Issue

What does mean the 'also' keyword in the request statement of dhclient-ethX.conf?
What is the difference between the following two?

option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
request rfc3442-classless-static-routes;
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
also request rfc3442-classless-static-routes;

Environment

Red Hat Enterprise Linux

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