What happens to the signal strength of an RF signal due to wave spreading?

What happens to the signal strength of an RF signal due to wave spreading?

• The signal strength of the RF signal will fall off quickly near the transmitter but more slowly farther away.
• The signal strength of the RF signal will fall off equally near the transmitter and also farther away.
• The signal strength of the RF signal will fall off slowly near the receiver and more quickly farther away.
• The signal strength of the RF signal will fall off slowly near the transmitter but more quickly farther away.

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