Which of the following Java SE exception handling blocks are valid?

a$.$ try$\{$

openFile$()$;

$\}$

finally$\{$

closeAndDispose$()$;

$\}$

b$.$ try$\{$

openFile$()$;

$\}$

finally$\{$

closeAndDispose$()$;

$\}$

catch$($ Exception ex$)\{$

$//$exception caught

$\}$

c$.$ try $\{$

opeFile$()$;

$\}$

catch $($Exception ex$)\{$

$//$exception caught

$\}$

finally $\{$

closeAndDispose$()$;

$\}$

d$.$ try $\{$

openFile$()$;

$\}$

closeAndDispose$()$;

catch$($Exception ex$)\{$

$//$ Exception caught

$\}$

finally $\{$

$//$finished

$\}$

e$.$ try $\{$

openFile$()$;

$\}$

catch$($NumberFormatException $|$ NullPointerException ex$)\{$

$//$exception caught

$\}$