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Some students experimenting with an uncharged metal sphere want to give the sphere a net charge using a charged aluminum pie plate. Which of the following steps would give the sphere a net charge of the same sign as the pie plate?

Bringing the pie plate close to, but not touching the metal sphere, then moving the pie plate away
Bringing the pie plate close to, but not touching, the metal sphere, then momentarily touching a grounding wire to the metal sphere
Bringing the pie plate close to, but not touching, the metal sphere, then momentarily touching a grounding wire to the pie plate
Touching the pie plate to the metal sphere

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