Which of the following best describes how the Compromise of 1850 affected the northern boundary of Texas?

The northern boundary runs along the 36/30 line and the Sabine River.
The Northern boundary runs along the Rio Grande and the 36/30 line.
The northern boundary runs along the Red River and the 32nd parallel.
The northern boundary runs along the Red River and the 36/30 line.

The correct answer is: The northern boundary runs along the Red River and the 36/30 line.