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The letter 'A' shown in the tachograph image:
AAllows to record the speed.
BAllows to select the driver's activities.Correct
CAllows to mark the distance travelled.
Explanation
The buttons marked with the letter A represent the selectors or activity switches of the analogue tachograph. These devices allow the driver and co-driver to manually select the activity they are performing at any given moment, such as other work, availability time, or rest periods. The other options are incorrect because both speed recording and distance measurement are automatic functions of the tachograph itself, recorded directly on the disc without the need for manual driver intervention via these buttons.
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