a$)$ How can decision tree models aid in enhancing the interpretability of machine learning systems, and what are their limitations$?$

$[2$ Marks$]$

b$)$ You are a ML engineer working in a large organization. Your organization is very popular and hackers always want to target your organization to tamish its image in the market. So$,$ the employees in your organization receive a lot of spam emails. Your boss asks you to build a spam filter for distinguishing between genuine e$-$mails and unwanted spam e$-$mails. Assuming spam to be the positive class, answer the following questions

$[5$ Marks$]$

Describe Precision and Recall with respect to the given problem $(1$ mark$)$

Explain what happens if you optimize each of the above parameters $(2$ marks$)$

Which would be more important to optimize and why? $(2$ marks$)$