The original commercial version of Ethernet supported $10$Mbdps bandwidth; the version introduced in the early $1990$s supports $100$Mbdps$,$ and in $1998,$ gigabit Ethernet was introduced. All versions use the same data frame formats, with the same maximum PDU sizes $,$ so they can interoperate freely. Given this information and what you know of layered technologiea, which of the following statement is true