Question: what does the command A ( : , 2 ) = [ ] do ? it would delete all the elements of the second column

what does the command A(:,2)=[] do?
it would delete all the elements of the second column
it would replace all the elements of the second row by zeros
it would replace all the elements of the second column by zeros
it would delete all the elements of the second row
it would give an error
what does the command A ( : , 2 ) = [ ] do ? it

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