What is crystal field splitting energy ?

Define crystal field splitting energy ?

If the crystal field splitting energy of a tetrahedral complex (Delta _(l )) of the type [ML_(4)]^(n+) is x e V what is the crystal field splitting energy with respect to an octahedral complex [ML_(6)]^(n+)?

The complex that has highest crystal field splitting energy ( triangle ), is:

The complex that has highest crystal field splitting energy ( triangle ), is:

The complex that has highest crystal field splitting energy ( triangle ), is: