In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following group of salts available in your school, a group each member of which, if dissolved in distilled water, will make it hard:<ol type = 'a'><li>Sodium chloride, calcium chloride</li><li>Potassium chloride, sodium chloride</li><li>Sodium chloride, magnesium chloride</li><li>Calcium chloride, magnesium chloride</li></ol>