Download the attached demand data $[$ Data $].$ Perform a regression using the Period and the quarterly dummy variables. What is the formula for forecasting the next period?

Question $10$ options:

$1956\mathrm{.}53+$

$468\mathrm{.}12*$ Period$$

$946\mathrm{.}23+$

$466\mathrm{.}12*$ Period $+$

$87\mathrm{.}32*$ Q$2+$

$-51\mathrm{.}87*$ Q$3+$

$2935\mathrm{.}23*$ Q$4$

$888\mathrm{.}34+$

$832\mathrm{.}32*$ Period $+$

$97\mathrm{.}15*$ Q$2+$

$-79\mathrm{.}27*$ Q$3+$

$1936\mathrm{.}13*$ Q$4$

$1478\mathrm{.}41+$

$535\mathrm{.}85*$ Period $+$

$24\mathrm{.}42*$ Q$2+$

$-41\mathrm{.}26*$ Q$3+$

$2845\mathrm{.}22*$ Q$4$