Ribosomal RNAs Are Synthesized and Processed Within the Nucleolus

Ribosomal RNAs are synthesized and processed within the nucleolus. Which of the following molecular mechanisms best describes the method by which a newly assembled 60S ribosomal subunit is made available to the translational machinery in the cytoplasm?

A) disassembled at the nuclear pore and reassembled in the cytoplasm
B) transported by transcytosis
C) transported out of the nucleus by active transport through the nuclear envelope
D) transported out of the nucleus by passive diffusion through the nuclear envelope
E) transported out of the nucleus through a nuclear pore complex