What is blind and measurement based ENDC?

Specs
#1

Hi Experts,
What is blind and measurement based ENDC?

Does it mean blind will choose only self 5G? Blindly?
So does interratb1 play a role or not?

#2

ENDC is triggered blindly immediately after Initial Context Setup without measurement, the
target of the SgNB must be defined ,Blind is preferred when coverage 4G & 5G is same like indoor site or same antenna.

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#3

Should ENDC mode be blind based or with inter rat b1 threshold?
Which is best and why?