After executing the following code:

int a $=5$;

int &b $=$ a;

b $=100$;

Please select the correct value for a and b$.$

Group of answer choices

a $=5,$ b $=100$

a $=100,$ b $=100$

a $=5,$ b $=$ a$\text{'}$s address

a $=$ value at address $100,$ b $=100$