Training Data $($one point which has three attributes$)$:When we presented the above point to the neural network, we found that the output values of neurons A and $B$ are: $($look at picture please$)$

a$)$Write the chain rules that are used to find the updated W$1?($don$\text{'}$t compute the updated W$1)$

b$)$ Find the update W$9$ by using suitable chain rules