Answer:
Long a call with a strike price lower than the call you are short, on the same underlying asset
Step-by-step explanation:
A bull put spread would involve one short put having a high strike price and 1 long put having a less strike price. It would be created for the net amount collected and the profits arise from increase in the stock price or from time erosion or from both the things
The option strategy that should be best described is that the call would be long having a strike price less than the short call for the similar underlying asset