Question:What would be the use of the following code?
function validate(field)
{
var valid=''ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'';
var ok=''yes'';
var temp; 
for(var i=0;i<field.value.length;i++)
{
temp='''' + field.value.substring(i,i+1)
if(valid.indexOf(temp)==''-1'')
{
ok=''no'';
}
} 
if(ok==''no'')
{
alert(''error'');
field.focus();
} 
}
 

A It will force a user to enter only numeric values 

B It will force a user to enter only alphanumeric values 

C It will force a user to enter only character values 

D None of the above 

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