Which two statements about PCIe are true?

A.	The PCIe link is built around dedicated unidirectional couples of serial, point-to-point connections known as lanes.
B.	You can install a PCI Express x8 adapter into an x4 slot.
C.	The PCIe standard is a bus-based system in which all the devices share the same bidirectional, 32-bit or 64-bit, parallel signal path.
D.	The PCIe 1.0 standard doubles the transfer rate compared to PCIe 2.0.
E.	A link that is composed of four lanes is called an x4 link.