What is the correct HTML code to create a table with two columns and the first cell spanning both columns?
<table><tr><td colspan="1"></td><td></td></tr></table>
<table><tr><td colspan="2"></td></tr><tr><td></td><td></td></tr></table>
<table><tr><td rowspan="2"></td><td></td></tr></table>
<table><td colspan="2"></td><td></td></table>