Two basic types of decision alternatives are used to close the gap between supply and demand in operations management: Supply options and DEMAND options. Which of the following are appropriate SUPPLY options for an organization that faces higher than expected demands?

discounting product prices in off$-$peak periods

introduction of complementary products

adjust workforce levels by hiring more employees

used subcontractors to provide extra capacity temporarily

$3$ and $4$ only

$1$ and $2$ only

$1$ and $3$ only

all of them

$2$ and $4$ only