Why the approximate calculations of composition of input and output field are called group methods?

It‚Äö√Ñ√∂‚àö√ë‚àö¬•s just a name

Because they are found only in groups

Because only input-output group is there

Because they deal only with input-output calculation and don‚Äö√Ñ√∂‚àö√ë‚àö¬•t consider what exactly happens

Why the approximate calculations of composition of input and output fi

1.	Why the approximate calculations of composition of input and output field are called group methods?
A.	Because they are found only in groups
B.	Because only input-output group is there
C.	Because they deal only with input-output calculation and don‚Äö√Ñ√∂‚àö√ë‚àö¬•t consider what exactly happens
D.	It‚Äö√Ñ√∂‚àö√ë‚àö¬•s just a name
Answer» D. It‚Äö√Ñ√∂‚àö√ë‚àö¬•s just a name