[Leaf] Leaf, an Employee of the California Department of Forestry

[Leaf] Leaf, an employee of the California Department of Forestry, insisted on signing inter-office memoranda with his name and the initials "FOJT", an abbreviation for his church "Followers of Jesus' Trees". Leaf's supervisor, Milo, told Leaf there was a rule prohibiting displays of religion at work and insisted that Leaf cease placing the initials of his church on government paperwork. When Leaf refused to follow the work rule, he was terminated.
-Leaf wants to file a lawsuit against the Department challenging his termination. What would a court most likely rule?

A) For the Department because the work rule did not substantially burden Leaf.
B) For the Department because it was only a work rule, and not a law.
C) For the Department because it did not violate the First Amendment.
D) For Leaf, because the work rule violated his free exercise of religion.
E) For Leaf, because the work rule violated the establishment clause.