New Account - Home phone services options

Hi all

When signing up for a new Vodafone account with VDSL the form has the following three options:

Transfer your existing home phone connection from another provider to Vodafone.

Get a new home phone connection on an existing (but inactive) phone line

Get a new home phone connection on a new phone line.

Number 1 is clear and not me (I need a new phone number as we're returning back to NZ and don't currently have any services) What's the difference between the other two options?

The house already has a phone line (so I assume option 2 applies). However if I selected the third option would Chorus install a new cable from the post outside to the demarcation point? I.e.replace the old black cable with cat6 or 5?

They're both same price.... so thinking of select the "new" phone line option.I assume replacing the black cable will only improve things?Thanks