You are troubleshooting the modem setup for a client who has a POTS pulse dial line in an older part of the city. The command for dialing the number of his ISP is set up as ATDT 821-1244. You have checked and 821-1244 is the number to reach the ISP. What might be the reason that this command is not successfully connecting to the ISP? (Choose all that apply.)
a. The command should be changed to ATDP 821-1244.
b. The command should be changed to AT S0=10 821-1244.
c. The ATDT command hangs up the phone line rather than initiating a call.
d. There must be a W before DT as in ATWDT 821-1244.
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