Which of the following is used to secure a litter tender's tie-in to the litter?

The girth hitch is the preferred choice for securing a litter tender's tie-in to the litter because it effectively creates a secure connection that allows for easy attachment and detachment. This hitch loops around the body of the litter and is designed to hold the litter firmly in place while distributing the load evenly. Its low-profile and secure nature make it ideal for situations where stability and ease of use are paramount, such as in a dynamic rescue environment.

In contrast, the other knots mentioned have different applications. The Munter hitch is primarily used for belaying and is best suited for controlled descent or ascent rather than securing a load in this specific context. The half hitch, while useful for securing a line, does not provide the same level of security or stability as the girth hitch when used with a litter. The clove hitch can slip if not under constant tension and is therefore not as reliable for securing a stationary load like a litter during transport. Thus, the girth hitch is the most effective and suitable choice for this application in a technical rescue scenario.