&nbsp;&nbsp; &nbsp;To select several cells in MS Excel which are not adjacent to each other, do ______ while selecting the cells:<br />
a)&nbsp;&nbsp; &nbsp;Hold down the Alt key<br />
b)&nbsp;&nbsp; &nbsp;Hold down the Shift key<br />
c)&nbsp;&nbsp; &nbsp;Hold down the Ctrl+Shift<br />
d)&nbsp;&nbsp; &nbsp;Hold down the Ctrl key