Can the select option value be of different types?

Answer 1

Yes, it is a string type, and could have any value. The value goes when you submit a form, and there are limitations.

The limitations depends which technology you are using on server end.

As in case of ASP.Net when you try to post special characters like & or especially < script > some script < / script > or the similar characters which are part of html tags or could be a dangerous script. The asp.net checks the posted data and throws exception. means some special characters are not allowed in value of select box with regards to asp.net

However the samples you given (except of having & it should be prefixed by amp;) are allowed and could be set in option tag value attribute.

Hope your understanding are build.