Based on your observations, which statements are true?

a$.$

The positive charges on the electroscope are the mobile charges.

b$.$

The negative charges on the electroscope are the mobile charges.

c$.$

Both positive and negative charges can move.

d$.$

An electroscope can be used to determine the charge type.

e$.$

An electroscope can only tell you that an object is charged, but not the type of charge.

f$.$

The larger the deflection of the needle on the electroscope, the closer the charged object is to the electroscope.