Live specimens are used for reference in taxonomic studies in

Which of the following is $NOT$ a significant contribution of botanical gardens?

$A:$ Botanical gardens are an $ex-situ$ conservation strategy for plants.
$R:$ The National Botanical Garden is situated at Howrah.

Ecological,economic,and ethnobotanical information is obtained from .........

$S$ Statement: Herbaria are generally associated with botanical gardens and educational or research institutions.
$R$ Reason: $A$ botanical garden is a planned collection of trees,shrubs,herbs,climbers,and other living plants brought from different parts of the world for scientific purposes.
$(a)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(b)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(c)$ $S$ is true and $R$ is false.
$(d)$ $S$ is false and $R$ is true.

Each statement in the key is called