Consider the following statements regarding open delta connection of transformers:

1. The capacity of the open delta bank is 57.7% of the capacity of the closed delta bank without overloading of windings.

2. The utilization factor of open delta without causing overloading of the transformer is 0.866.

3.  If 100% load is maintained on open delta bank, each single-phase transformer overloaded by 73%.

4. At 57.7% of the total load each single-phase transformer is under loaded by 13.3%.

Which of the above statements are correct?