The answer isnt 7 thats forsure
Are there options for the answers or not? If there is add the options.
Yo I’m just here so I can ask my question!
Answer explaining=
Answer:
I do 1 option for you as an example, you need to check the leftover by yourself.
Step-by-step explanation:
for d) y(0) = 0 and y'(pi) =0



Replace
we have
if and only if 
Hence the given solution does not work.
then, d is NOT the correct answer.