I have attached a table:

I am doing an excercise and can't make heads or tails of the following:

a$.$ identify the correct type of "NAT" and provide the full name $($ex: Source PAT$)$

b$.$ write the appropriate "NAT" rule for the scenarios below

Scenarios:

a$.$ Ensure everyone from the internet can access the internal web server using the standard unencrypted and encrypted web ports.

b$.$ Ensure all email servers from the internet can access the Email Server on its standard mail transfer port

c$.$Ensure our email server can send emails using the standard mail transfer port to all email servers on the internet.

d$.$ Ensure the internal network can access all web servers using the standard unencrypted and encrypted web ports

e$.$ Ensure the internal network can access the DNS server using the standard client lookup port.