Web storage ensures data integrity by adhering to the same$-$origin policy, which $\_\_\_\_\_.$

a$.$bars a website from accessing data stored by a web page with a different protocol, port, or host

b$.$restricts the transfer of data between web pages of the same origin

c$.$prevents a web page from accessing data stored by a page with the same protocol, port, and host but a different path

d$.$allows the transfer of data between web pages when either the protocol, the port, or the host is the same for both pages