manual wording unclear regarding inline versus external methods

[metaperl]

Re: http://www.gnu.org/software/tramp/#Connection-types

We read: 
"""
The content of the file can be transfered over the same connection used to
log in to the remote machine or the file can be transfered through another
connection using a remote copy program such as rcp, scp or rsync. The former
are called inline methods, the latter are called out-of-band methods or
external transfer methods (external methods for short). 
"""

But former and latter can only be used when discussing two items - the first
would be the former and the second would be the latter. In this case, 3
items are listed, so former and latter is unclear.

Which methods are inline and which are external?

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