Enthuware

for second option the explanation says :
They are different only in the look/feel of the login screen. Both transmit the data without any encryption. Though BASIC uses Base64 encoding.

for third option it says :

FORM uses base64.

so do both FORM and BASIC uses base64 encoding ? according to me only BASIC does ?

You are right. Encoding in case of a form depends on the content type specified by the enctype attribute of the FORM element. By default this value is "application/x-www-form-urlencoded".

This has now been corrected.

thank you for your feedback!