What is the signer in Version 1 transfer transactions?

Technical Discussion
#1

When I am creating a transfer 1 transaction the documentation shows the following JSON:

{
        "transaction":
        {
            "timeStamp": 9111526,
            "amount": 1000000000,
            "fee": 3000000,
            "recipient": "TBOBBSXX7BESJXDWGLP5Z7FM5HSTKUH5WIMPW562",
            "type": 257,
            "deadline": 9154726,
            "message":
            {
                "payload": "",
                "type": 1
            },
            "version": -1744830463,
            "signer": "a1aaca6c17a24252e674d155713cdf55996ad00175be4af02a20c67b59f9fe8a"
        },
        "privateKey": "00983bb01d05edecfaef55df9486c111abb6299c754a002069b1d0ef4537441bda"
}

As far as I understood, the recipient is an address of the person whom I am going to send coins, privateKey is the private key of the person who sends the coins. But what is signer?

#2

The public key of the account making the transaction, I think.

#3

This seems unnecessary. I already provided the private key of the account making the transaction. So it is straightforward to get the public key.

#4

Sure, but you provide the private key to sign the transaction; it’ll be omitted when it’s prepared for broadcast.

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