Ariel, a major character in "The Tempest," serves Prospero. For which of the following reasons does Ariel owe servitude to Prospero?
1
Ariel was a sworn enemy of Prospero before the latter took over the island.
2
Ariel is bound by an earlier agreement to serve Prospero indefinitely.
3
Prospero saved Ariel from captivity within a pine tree by the witch Sycorax.
4
Ariel lost a bet to Prospero and has to serve him as a result.