How do I handle the Salesforce Security Token in ConnectionStrings.config?

The security token allows S4S to establish a Salesforce Session. There are three ways to handle the security token:

Don't use it. Instead, add your server IP to the Salesforce Organisations trusted IP address ranges (Salesforce > Setup > Security Controls > Network Access). Adding a trusted IP address range requires elevated administrator privileges.
Append the Security Token to the password like "password=egPassword12lG0I7QExample0pOkshUtY0aA".
Add the Security Token as a token key like "password=egPassword12;token=lG0I7QExample0pOkshUtY0aA".