Which two statements about the IPv4 ToS byte are true? (Choose two.)

A.
The ToS byte is located in the Layer 2 header.

B.
The ToS byte is located in the Layer 3 header.

C.
The DSCP values range from 0 to 7.

D.
The IP precedence and the DSCP fields have two overlapping bits.

E.
The class selector in the DSCP field is defined for backward compatibility with IP precedence.