The double integral $$\int\limits_0^{\text{a}} {\int\limits_0^{\text{y}} {{\text{f}}\left( {{\text{x, y}}} \right){\text{dx dy}}} } $$ is equivalent to
A. $$\int\limits_0^{\text{x}} {\int\limits_0^{\text{y}} {{\text{f}}\left( {{\text{x, y}}} \right){\text{dx dy}}} } $$
B. $$\int\limits_0^{\text{a}} {\int\limits_{\text{x}}^{\text{y}} {{\text{f}}\left( {{\text{x, y}}} \right){\text{dx dy}}} } $$
C. $$\int\limits_0^{\text{a}} {\int\limits_{\text{x}}^{\text{a}} {{\text{f}}\left( {{\text{x, y}}} \right){\text{dy dx}}} } $$
D. $$\int\limits_0^{\text{a}} {\int\limits_0^{\text{a}} {{\text{f}}\left( {{\text{x, y}}} \right){\text{dx dy}}} } $$
Answer: Option C

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