I'm a bit confused by this question. Is it asking about the recommended distance or the actual test distance? I'm not sure if I fully understand the context.
Okay, let's see. The question is asking for the recommended test distance, so I'm guessing it's looking for the optimal range. I'll go with D, less than 10 m.
Tarra
1 day agoLaquita
6 days agoMyong
11 days agoCory
17 days agoRose
22 days agoMitsue
27 days agoEttie
2 months agoMeaghan
2 months agoWenona
2 months agoRobt
2 months agoGlory
2 months agoGrover
2 months agoFlorinda
3 months agoDorcas
3 months agoPaulina
3 months agoKathrine
3 months agoTatum
3 months agoGilberto
3 months agoLewis
4 months agoChantay
4 months agoCorinne
4 months agoJules
4 months agoKanisha
4 months agoLon
5 months agoIrving
5 months ago