Why is the particle emitted by the decay of the K-37 nucleus deflected away from the positively charged plate?

Question options:

The particle is an electron, which has a negative charge and is therefore repelled by the positive charges on the plate.


The particle is an electron, which has a positive charge and is therefore repelled by the positive charges on the plate.


The particle is a positron, which has a positive charge and is therefore repelled by the positive charges on the plate.


The particle is a positron, which has a negative charge and is therefore repelled by the positive charges on the plate.