The extension of Gaussian quadrature to two-dimensional integrals of t

1.	The extension of Gaussian quadrature to two-dimensional integrals of the form of _____
A.	I ( sum_{i=1}^{n} sum_{j=1}^{n} )w<sub>i</sub>w<sub>j</sub>f( <sub>i</sub>, <sub>j</sub>)
B.	Natural co-ordinates
C.	w<sub>1</sub>f( <sub>1</sub>)+w<sub>2</sub>f( <sub>2</sub>)
D.	w<sub>1</sub>f( <sub>1</sub>)
Answer» B. Natural co-ordinates

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