Letsencrypt PEM files to use for SSL

I just installed "Monit 5.25.2" on a FreeBSD-11.2 / amd64 machine. The
application is working fine and I have slowly, but surely gotten it
configured. I do have a question though regarding "SSL"

From the manual, this is a skeleton for the "SET SSL" section:

SSL OPTIONS
       
Common SSL/TLS options can be set using the following statement and
will apply to all SSL connections made through Monit:

SET <SSL | TLS> [OPTIONS] {
    VERSION: <AUTO | SSLV2 | SSLV3 | TLSV1 | TLSV11 | TLSV12 | TLSV13>
    VERIFY: <ENABLE | DISABLE>
    SELFSIGNED: <ALLOW | REJECT>
    CIPHERS: <string>
    PEMFILE: <path>
    CLIENTPEMFILE: <path>
    CACERTIFICATEFILE: <path>
    CACERTIFICATEPATH: <path>
}

Now, I am using "letsencrypt" on my machine. I am confused as to what files
go where. Letsencrypt has these files available:

1) cert.pem
2) chain.pem
3) fullchain.pem
4) privkey.pem

I was told that "monit" will not accept the "fullchain.pem" file unless the
"privkey.pem" is added to the top of it.

What I want to know is what keys are used for each of the "PEMFILE",
"CLIENTPEMFILE", and "CACERTIFICATEFILE" file entries. I am using the
"ca-root-nss.crt" file path for the " CACERTIFICATEPATH"; i.e,
"/usr/local/share/certs/ca-root-nss.crt". Also, do I have to all the
"privkey.pem" to the "fullchain.pem" in order for "monit" to accept it?

Thanks!

-- 
Gerard

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