Newbie Question SSL Apache

[R. Markham]

Hallo,   I have a question regarding SSLCACertificateFile from the SSL-Apache in http.conf File. I have a  server certificate which is issued by our Sub CA. My Question which Certificate must I use the Root CA or the Sub CA Certificate. The Root CA Certificate is issued by DFN-PCA in Hamburg/Germany, and the Sub CA is produced by our selves.   TIA   R. Markham