In manual white blood cell count using haemocytometer the dilution used is:

<p><strong><span>a- Normal saline</span></strong></p> <p><strong><span>b- Sodium chloride</span></strong></p> <p><strong><span><span>c- Glacial acetic acid</span></span></strong></p> <p> </p> <p><span><strong>d- Water</strong></span></p>