what should be included in the client ovpn markers?

[goldduo]

i am using a windows openvpn server, and a windows client.
in the client.ovpn config file, there are 4 markers: <ca>, <cert>, <key>, and <tls-auth>
<tls-auth> should have the contents of ta.key?
what should be in <cert>? is it the contents of server.crt? or client.crt?
how about <key>? is it from server.key or client.key?

thanks

[goldduo]

my understanding is the <cert> and <key> markers are not required if i specify file paths to client.crt and client.key??

so to connect, the client sends ca.crt, asking for specific ip and port number. the server recognizes the ca.crt, and knows that this is a client. now how does that server authenticate the client? it automatically reaches into the default relative path openvpn\easy-rsa\pki to grab and compare the client.crt, and client.key?