Use the weather map to answer the question. Weather map with blue line with triangles pointing down and to the right. Red line with semi-circles pointing up and to the right. Red line is to the right of the blue line.
© Dorling Kindersley / Universal Images Group / Image Quest 2016

What does the red line indicate?

A cold front is moving to the north and east.
A cold front is moving to the south and west.
A warm front is moving to the north and east.
A warm front is moving to the south and west.