Plesk SSL Server Type?

I'm purchasing an SSL certificate from GeoTrust for use on a box running Plesk. It asks for the server type and I'm not sure what it is. The HTTP headers say:

Server: Apache/1.3.22 (Unix) (Red-Hat/Linux) FrontPage/5.0.2.2623 mod_ssl/2.8.5 OpenSSL/0.9.6b PHP/4.1.2 mod_perl/1.26

Do I have "Apache + OpenSSL" or "Apache + Mod SSL"? The HTTP header lists both, but which should I choose for the purposes of purchasing a certificate?

 

 

 

 

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