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{Qustion} Reverse DNS setup at ARIN

Thanks for reading this article, first.

I read this article (http://en.wikipedia.org/wiki/Reverse_DNS_lookup) to better understand reverse DNS.

We got a IP block /24 through ARIN. For example, we got 198.x.x.x/24 like below.      

ReverseDNSadjusted1.jpg

When I select a delegation "0.x.198.in-addr.arpa." I can setup hostname of name servers like below.

ReverseDNSadjusted2.jpg

This is my quesiton.

1. We have two Public DNS servers. one of DNS server's public IP will be same range 198.x.x.x/24 and other will be different IP address. As I understand it doesn't matter whether I use any hostname of DNS. i.e  ns3.test.com, ns4.test.com etc because it just uses for DNS lookup. Am I correct?

2. Once I setup, ns?.test.com as Reverse DNS at ARIN's website, every traffic belonging to our public IP range (198.x.x.x/24) will be resolved through our public DNS servers. Am I correct?

3. I need to better understand DS. Currently DS (Delegation Signer) record is /24 (0.x.198.in-addr.arpa.) and I can assign hostname of name servers as multiple.  is it possible to assign /32 host with directly dns name?  i.e   198.1.1.1/32 with ns1.test.com so I don't use any public DNS server. I guess not. ^_^

ReverseDNSadjusted3.jpg

4. One of ISP asked me to choose one of options for Reverse DNS like below. In my case, I believe I need to select "No" since we are authorative for this IP blocks. Am I correct?  I guess when I need to lease IP blocks through ISP, I check "Yes" to get their Reverse DNS service.

    Do you need xxx (ISP name) to resolve reverse DNS?
     [   ] No
     [   ] Yes (Engineer will work with you during test and turn-up) 
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