In the Previous Three Problems, the Product Solutions Are
A)

Multiple Choice

In the previous three problems, the product solutions are

A) $u = J _ { 0 } \left( z _ { n } r / 2 \right) \left( a _ { n } \cos \left( z _ { n } t / 2 \right) + b _ { n } \sin \left( z _ { n } t / 2 \right) \right)$
B) $u = J _ { 0 } \left( z _ { n } r / 2 \right) a _ { n } \cos \left( z _ { n } t / 2 \right)$
C) $u = J _ { 0 } \left( z _ { n } r / 2 \right) b _ { n } \sin \left( z _ { n } t / 2 \right)$
D) $u = J _ { 0 } ( n \pi r ) b _ { n } \sin ( n \pi i )$
E) $u = J _ { 0 } ( n \pi r ) a _ { n } \cos ( n \pi i )$