Which SSL Certificate file to use

Which SSL Certificate file to use

I used RapidSSL for my certificate. I submitted my CSR data online, by coping and pasting the contents of the CSR file.
They then supplied me with some download options after they generated and issued the certificate.

First, I have two possible formats to download the certificate:
Either to download a certificate in PKC7S format, or a X.509 certificate.

Second, I have the three additional options that I can choose:
1. Plesk bundle
2. Certificate Issuer
3. Apache bundle

Would it be correct that I must choose one of the certificate formats, and then also download the "Certificate Issuer" file?
Which is correct, the PKC7S or X.509 option?

I really hope this makes sense.
Thanks in advance.
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