Which word fits well in all the sentences? 

(i) The store was ________ for the day, and customers were asked to come back tomorrow.

(ii) The database was ________ to only authorized personnel, ensuring the confidentiality of sensitive information.

(iii) The road was ________ for maintenance, and drivers were asked to take alternate routes.

(iv) The exhibit was ________ due to unforeseen circumstances, disappointing many visitors.