plz help me

hello 
plz hellp me 2 answer this qustion 
- consider HTML tabel cell it defined by the following tag:
<TD COLSOAN=3 WIDTH="45">
How wide will this table cell be ?
1- The cell's width be 3 columns.
2- The cell's width be 45% of the windows .
3- The cell's width be 45 pixels.
4- The cell's width be 45 millimeters 
i hope to see ur answer neer cuz i'll enter exam CIW 410

plz help me 

thanks and regards 
wael_web@hotmail.com
wael khedr