Prevention of laboratory infection depends on understanding of:

<p style="text-align:left;">a<strong>- routes by which infections are acquired</strong></p> <p style="text-align:left;"><strong>b- which organisms are the most hazardous</strong></p> <p style="text-align:left;"><strong>c- which techniques are the most hazardous</strong></p> <p> </p> <p style="text-align:left;"><strong>d- all of the above</strong></p>