Upgrade subject to access all content

What is the sum to infinity of the following series?

$$\sum _{ n=0 }^{ n=\infty }{ \cfrac { 1 }{ ( 2n ) ! } } $$

$\cfrac{ { e }^{ 2 }+1 }{2e}$

$\cfrac{ { e }^{ 2 }-1 }{e}$

$\cfrac{e+1 }{2e}$

$\cfrac{ { e }^{ 2 }+1 }{e}$