(b) The court, for good cause shown, may make any order that justice requires to protect any party from unwarranted annoyance, embarrassment, oppression, or undue burden and expense. This protective order may include, but is not limited to, one or more of the following directions:

1. (1) That the set of admission requests, or particular requests in the set, need not be answered at all.
2. (2) That, contrary to the representations made in a declaration submitted under Section 2033.050, the number of admission requests is unwarranted.
3. (3) That the time specified in Section 2033.250 to respond to the set of admission requests, or to particular requests in the set, be extended.
4. (4) That a trade secret or other confidential research, development, or commercial information not be admitted or be admitted only in a certain way.
5. (5) That some or all of the answers to requests for admission be sealed and thereafter opened only on order of the court.