Which of the following is a circuit board that is used to extend slots for expansion cards and provides
the ability to connect additional
expansion cards to the computer?

A.
Communication and Networking Riser (CNR)

B.
Audio/modem riser

C.
Riser card

D.
Secure Digital (SD) card

Explanation:

Riser card is a circuit board that is used to extend slots for expansion cards and provides the ability
to connect additional expansion cards to
the computer. These cards are used with LPX motherboards. With the introduction of ATX
motherboards, riser cards are rarely used. In ATX
motherboards, the expansion cards connect directly to the computer motherboard instead of using
riser cards.

Answer option B is incorrect. The audio/modem riser (AMR), also known as an AMR slot, is an
expansion slot. It is found on the motherboards
of some Pentium III, Pentium 4, and Athlon personal computers. It was designed by Intel to interface
with chipsets and provide analog
functionality, such as sound cards and modems, on an expansion card. It has two rows of 23 pins
each, making a total of 46 pins.
Answer option A is incorrect. Communication and Networking Riser (CNR) is a hardware device
developed by Intel. It plugs into the
motherboard and holds chips for the functioning of devices such as modems and audio devices. It
supports V.90 analog modem, multi-channel
audio, phone-line-based networking, and 10/100 Ethernet-based networking. CNR also minimizes
electrical noise interference through the
physical separation of noise-sensitive elements from the motherboard’s communication systems.
Answer option D is incorrect. Secure Digital (SD) card is a non-volatile memory card format used in
portable devices such as mobile phones,
digital cameras, and handheld computers. SD cards are based on the older MultiMediaCard (MMC)
format, but they are a little thicker than
MMC cards. Generally an SD card offers a write-protect switch on its side. SD cards generally
measure 32 mm x 24 mm x 2.1 mm, but they can
be as thin as 1.4 mm. The devices that have SD card slots can use the thinner MMC cards, but the
standard SD cards will not fit into the
thinner MMC slots. Some SD cards are also available with a USB connector. SD card readers allow SD
cards to be accessed via many
connectivity ports such as USB, FireWire, and the common parallel port.
Reference: “http://en.wikipedia.org/wiki/Riser_card”