In a specific video game scenario, you are given 2,000 gold. you can either train soldiers to defend your base at 50 gold a piece or research weapon upgrades at 500 gold per upgrade. the game allows a maximum of three upgrades, and you know that you need at least 20 soldiers trained to survive the next level. which of the following is a possible combination of the number of soldiers (s) and the number of upgrades (u) you can train/purchase in the game scenario? 10 soldiers; 2 upgrades20 soldiers; 4 upgrades30 soldiers; 3 upgrades40 soldiers; 0 upgrades