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.
