To track physical disk activity, you would use the command "diskperf -y". Let's go through each option to understand why it is correct or incorrect:
Option A) pdisk /y - This option is incorrect because there is no command called "pdisk" for tracking physical disk activity.
Option B) disk /y - This option is incorrect because the "disk" command does not have a "/y" option for tracking physical disk activity.
Option C) disk /active? - This option is incorrect because the "disk" command does not have an "/active?" option for tracking physical disk activity.
Option D) diskperf -y - This option is correct because the "diskperf" command with the "-y" option enables disk performance counters, allowing you to track physical disk activity.
The correct answer is D) diskperf -y. This option is correct because it enables disk performance counters, which are used to track physical disk activity.