This author's most recent output includes titles like The Cuckoo's Calling, The Silkworm, and Career of Evil under the pseudonym Robert Galbraith. She created the character who attends a School of Witchcraft and Wizardry for six years to defeat Voldemort. Who is this English author known for creating Harry Potter?
a) J.R.R. Tolkien
b) J.K. Rowling
c) George R.R. Martin
d) C.S. Lewis