Key Component of the Compromise of 1850

During the 1850s, tensions between slave states and free states were escalating in the United States. In an attempt to resolve some of these conflicts, Congress enacted the Compromise of 1850. This legislation aimed to address the status of territories acquired during the Mexican-American War and included various measures to appease both pro-slavery and anti-slavery factions. Which of the following was a key component of the Compromise of 1850?