Find the linear approximation of the function ( f(x, y) = √14 - x² - 4y² ) at the indicated point ((1, 1)).
a) ( 1 - /1/2(x-1) - /1/2(y-1) )
b) ( 3 - /1/2(x-1) - /1/2(y-1) )
c) ( 2 - /1/2(x-1) - /1/2(y-1) )
d) ( 4 - /1/2(x-1) - /1/2(y-1) )