In birth control methods,which one is an intra-uterine device?

In delaying pregnancy or spacing among children,the ideal contraceptive is

Which of the following contraceptive devices is inserted by a doctor or a trained nurse into the uterus through the vagina?

Oral contraceptive pills contain

How many devices are included in Intra Uterine Devices (IUDs) from the following list: Lippes loop,Multiload $375$,Cu-$T$,$LNG$-$20$,Condom,Diaphragm,Cervical Cap,Vaults?

What is the function of Copper $T$?