QuestionIf the null space of a $7 \times 5$ matrix is 4 -dimensional, find rank $A$, $\operatorname{dim} \operatorname{Row} A$, and $\operatorname{dim} \operatorname{Col} A$. A. rank $A=1, \operatorname{dim} \operatorname{Row} A=4, \operatorname{dim} \operatorname{Col} A=4$ B. rank $A=1, \operatorname{dim} \operatorname{Row} A=1, \operatorname{dim} \operatorname{Col} A=4$ C. rank $A=3, \operatorname{dim} \operatorname{Row} A=3, \operatorname{dim} \operatorname{Col} A=3$ D. $\operatorname{rank} A=1, \operatorname{dim} \operatorname{Row} A=1, \operatorname{dim} \operatorname{Col} A=1$