Either—
(a) read in good daylight (with the aid of corrective lenses if worn) a registration mark fixed to a motor vehicle and containing letters and figures 79 millimetres high and 57 millimetres wide at a distance of—
(i) 12.3 metres, in the case of a test conducted in respect of a vehicle included in category K;
(ii) 20.5 metres, in any other case or
(b) read in good daylight (with the aid of corrective lenses if worn) a registration mark fixed to a motor vehicle and containing letters and figures 79 millimetres high and 50 millimetres wide at a distance of—
(i) 12 metres, in the case of a test conducted in respect of a vehicle included in category K;
(ii) 20 metres, in any other case.