What's the difference between DIVERSITY and VARIETY? Thank you!

what does "without unreasonable effort or expense" mean here? Thank you in advance! PART II—RULES 12b-25(b) AND (c) If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check box if appropriate) ☒ (a) The reasons described in reasonable detail in Part III OF this form could not be eliminated without unreasonable effort or expense; ☒(b) The subject annual report, semi-annual report, transition report on Form 10-K, Form 20-F, Form 11-K, Form 10-Q, Form 10-D, Form N-SAR or Form N-CSR, or portion thereof , will be filed on or before the fifteenth calendar day following the prescribed due date; or the subject quarterly report on Form 10-Q or subject distribution report on Form 10-D, or portion thereof , will be filed on or before the fifth, calendar day following the prescribed due date; and

What does DUE UPON DEMAND AND UNSECURED mean here? The loan is non-interest bearing, due upon demand and unsecured.

How do you understand"for which" in the last sentence? Dose which refer to the transcation? THanks! No new accounting policies were adopted and the application of existing accounting policies was not changed during 2016. We noted no transactions entered into by the Company during the year for which accounting policies are controversial or for which there is a lack of authoritative guidance or consensus or diversity in practice.Does "for" here mean becasue?

Is there any difference between these two sentences? Thank you! 1. Peter shall be in Vegas next week. 2. Peter will be in Vegas next week.

What does it mean in the second sentence? Thank you! Unless otherwise noted, the information set forth herein is as of December 31, 2016. We disclaim any undertaking to advise you of changes that may be brought to our attention thereafter. Does it mean we can't promise that there won't be any changes brought to our attention thereafter?