Using the sensor information from Sentinel$-2($A$)$ MSI $($Table $1)$ compute the Normalised

Difference Vegetation Index $($NDVI$)$ for the image $($Table $2).$

$($a$)$ Show the NDVI equation for Sentinel$-2$ with the correct bands allocated

$($b$)$ Compute NDVI for the pixels shown in Table $2$