What needs to be done to enable 32 bit I/O transfer mode for (E)IDE disks, on a system running a 2.4 series Linux kernel?

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What needs to be done to enable 32 bit I/O transfer mode for (E)IDE disks, on a system running a 2.4 series Linux kernel?
A . The Linux kernel must be recompiled.
B . The sysctl utility must be used.
C . The hdparm utility must be used.
D . This feature isn’t supported in 2.4 series kernels.
E . This feature is enabled by default in 2.4 series kernels

Answer: C