In a database of employees, Last Name would be a good field to use as the primary key

SSIs can use keyword _______ to indicate a _______ path on the server.

(a) virtual, physical. (b) file, physical. (c) file, virtual. (d) physical, file.

Enhancements to HTML and to modern browsers have allowed browsers themselves to perform many validation tasks without any extra JavaScript. This type of validation is known as __________ validation. ?

Fill in the blank(s) with the appropriate word(s).