Steric Repulsion | Multi Centered Bonds | 3 centered 2 electron Bond

Which of the following has a 3 centred 2 electron bond?

Which of the following statements are correct regarding diborane? I. Two bridged hydrogen atoms and two boron atoms in one plane. II. Out of six B-H bond, two bonnds can be described in terms of 3 centre-2 electron bonds. III. Out of six B-H bonds, four B-H bonds can be described in terms of 3 centre-2 electron bonds. IV. Four terminal B-H bonds are two centre electrons regular bonds.

Assertion : In IOF_(4)^(-) a single lone pair is present an iodine atom trans to oxygen to have minimum repulsion between the I=0 and the lone pair of electrons. Reason : The VSEPR model consider double and triple bonds to have slightly greater repulsive effect then single bonds bonds because of the repulsive effective pi electrons