Which statement about 4G wireless communications is correct?

	a.	Major 4G networks use circuit-switching rather than packet-switching approaches.
	b.	Eventually, 4G will make worldwide roaming as well as universal access possible.
	c.	The bandwidth and latency of 4G networks enable rapid streaming of VR content.
	d.	A two-hour movie can be streamed in less than 3 seconds over a 4G network.