Determine the correctness or otherwise of the following $\text{Assertion (a)}$ and $\text{Reason (r)}.$
$\text{Assertion:}$ Immobilization of plant cells can enhance secondary metabolite production during bioreactor cultivation.
$\text{Reason:}$ Immobilization protects the plant cells from shear forces in the bioreactor
- Both $(a)$ and $(r)$ are true and $(r)$ is the correct reason for $(a)$
- Both $(a)$ and $(r)$ are true but $(r)$ is not the correct reason for $(a)$
- $(a)$ is true but $(r)$ is false
- $(a)$ is false but $(r)$ is true