Evaluate the indefinite integral $$ex$+44$dx$$ex$+44$dx$.$

Select one:

a$.$

e$2$x$+88+$Ce$2$x$+88+$C

b$.$

e$2$x$4+$Ce$2$x$4+$C

c$.$

e$2$x$+48+$Ce$2$x$+48+$C

d$.$

ex$+44+$C