Interchanging GLP$-1$ RA products may be considered for a variety of reasons. Which of the following reasons for a product interchange requires initiating the new GLP$-1$ RA at the lowest dose?

A$.$ Desire to switch from a once$-$daily to a once$-$weekly GLP$-1$ RA B$.$ Need to reduce gastrointestinal $($GI$)$ discomfort C$.$ Request to switch from an injectable to an oral GLP$-1$ RA product D$.$ All GLP$-1$ RA interchanges require initiating the new product at the starting dose