When selling covered calls, there are a couple of things a broker could do if the stock has a sharp increase. Here's an example:

```

Buy Stock: $100
Sell Call $120@1month: $1

```

Two days later, the stock spikes up to $120 and my call now costs $22. The broker can do two things:

```

Plan #1:  Wait for someone to execute the calls on the stock you already own.
+$1: Sell the call
+$0: Exercise the call.
---
$1: Profit

Plan #2:  Buy the call at the current price to cover.
-$22:  Buy the long call
+$20:  Difference in stock price
+ $1:  Sell the short call
---
-$1: Loss

```

I think that I would want #1, but what if the broker forces #2. I think this is a question of acceptable margin. However, there really is no risk to the broker since I already own the stock. How can I be sure they don't do #2 on me?