$3-$ Do some research about $401($k$)\_$plans and address the following:

a$)$ What is the maximum contribution an employee can make to his or her $401($k$)$ plan in $2023?$ Answer is in dollars.

b$)$ What is the maximum contribution an employee and employer combined can make to one's $401($k$)$ plan in $2023?$ Answer is in dollc

c$)$ Identify TWO of the potential challenges one should be aware of relative to a $401(k)$ plan? Answer in $1-2$ sentences.