Can we draw the following hypothesis from the context (see options)? 

Context:

Do you make these errors when using high-potential (hi-pot) testers or insulation resistance testers? • Using without isolating first. The hi-pot injects a high voltage into cabling. Normally, you isolate a circuit to protect yourself from the premises source. In this case, you isolate the circuit to protect others (and connected equipment) from your portable source. •​ Isolating the cable at one end only. You must isolate it at each end, else you’re providing ...

Hypothesis: hi-pot testers were isolated first
Available choices: [i] Yes [ii] It's impossible to say [iii] No