One of the Windows 7 computer users that you support in your company has a 56 Kbps modem, but he complains that it typically communicates with his ISP at 24 Kbps or slower. Why is this? (Choose all that apply.)
a. The maximum speed setting for the modem’s serial port is 24,000.
b. The modem does not have a controller.
c. The modem is negotiating down to a slower speed because there is noise on his telephone line.
d. The modem is not using the faster AT command set.
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