For whom is the K-4 Visa designated?

The K-4 Visa is specifically designated for the children of K-3 Visa holders. The K-3 Visa is a non-immigrant visa for foreign-citizen spouses of U.S. citizens, allowing them to enter the United States while they wait for their immigrant visa applications to be processed. Consequently, a K-4 Visa allows the dependent children of these K-3 Visa holders to accompany or join their parent in the United States.

Understanding this context clarifies why the K-4 designation is relevant specifically to the child of a K-3 Visa holder, not to other relationships. For instance, the other answer choices involve children of U.S. citizens or L-1 workers, which do not fall under the K-4 Visa provisions. Thus, the classification linked to the K-4 Visa is strictly confined to the progeny of K-3 Visa holders.