What is the primary function of the Lemon test?

a$)$ to determine if speech or expression contains sufficient value so as not to be

deemed obscene

b$)$ to determine whether or not certain ideas or expression should be censored

before they are said or printed

c$)$ to determine whether or not the establishment clause of the First

Amendment has been violated

d$)$ to determine if an action or speech is likely to result in immediate,

dangerous, and illegal actions