What is the equivalent Boolean expression$/$function for Boolean expression$/$function below?

F $=($X $.$ Y $.$ Z$)\text{'}$

a$.$

F $=$ X $+$ Y$\text{'}.$ Z$\text{'}$

b$.$

F $=$ X $.$ Y$\text{'}+$ Z$\text{'}$

c$.$

F $=$ X$\text{'}.$ Y$\text{'}.$ Z$\text{'}$

d$.$

F $=$ X$\text{'}+$ Y$\text{'}+$ Z$\text{'}$