If language L is $\{$bro$,$ sis$\}$ and language M is $\{$fra$,$ sor$\},$ then what are the results for each of the regular operations shown below?

a$)$ L $+$ M

b$)$ L $$ M

c$)$ L$*$

d$)$ M$*$

Please draw out diagrams, if needed, to explain things better. I$\text{'}$m a visual learner. Thank you!