Which of the necessary conditions does not include for AMR full-rate to AMR half-rate switching to occur?

Which of the necessary conditions does not include for AMR full-rate to AMR half-rate switching to occur?
A . The parameter " Handover allowed in the cell" is set to "Yes"
B. The parameter "Allow half-handover in the cell" is set to "Yes "
C. RQI is greater than the " threshold from TCHF to TCH H " and maintains for a period of time
D. The cell load is higher than the "AMR call priority allocation half-rate cell load threshold"

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Answer: A