ow does one calculate the rolled throughput yield $($RTY$)?$

Question $1$ options:

a$)$

Multiply the throughput yields for each step of the process

b$)$

Calculate e$-$throughput yield for each step of the process and multiply these values together

c$)$

Add the throughput yields for each step of the process

d$)$

Calculate e$-$throughput yield$$for each step of the process and$$add$$these values together