The cost curve facing a firm is TC(Q)=3Q+8Q+192 where: Q is the number of units produced per time period.

The cost curve facing a firm is 

TC(Q)=3Q²+8Q+192

where: 

Q is the number of units produced per time period.

TC is cost of production in dollars

At Q = 4,

1) 

5 > Slope of Average Cost > 0; Marginal Cost - Average Cost < 10

2) 

Slope of Average Cost < -10; Average Cost - Marginal Cost > 40

3) 

-10 <Slope of Average Cost < 0; Average Cost - Marginal Cost < 40

4) 

Slope of Average Cost > 5; Marginal Cost - Average Cost > 10

Please give me the full solution.