Find the null space for $A = \left[\begin{matrix} 2 & 5 \cr 2 & 6 \cr \end{matrix}\right].$

What is null$(A)$?

A. $\left\{\left[\begin{matrix} 0 \cr 0 \cr \end{matrix}\right]\right\}$
B. span$\left\{\left[\begin{matrix} -2 \cr 2 \cr \end{matrix}\right]\right\}$
C. span$\left\{\left[\begin{matrix} -5 \cr 2 \cr \end{matrix}\right]\right\}$
D. ${\mathbb R}^2$
E. span$\left\{\left[\begin{matrix} 2 \cr 5 \cr \end{matrix}\right]\right\}$
F. span$\left\{\left[\begin{matrix} 2 \cr 2 \cr \end{matrix}\right]\right\}$
G. none of the above
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