Answer:
Colon.
Step-by-step explanation:
As per the rules, a colon(:) is usually employed for several purposes like introducing a list or series of items, initiate an appositive or quotation the sentence.
In order to link two independent clauses also a colon(:) is employed if the later clause functions to explain, illustrate, or modify the prior clause. The first clause creates a supposition that is accomplished by the introduction of the later clause. For example:
"I have a list of works to be done: first, I need to pack my bags for tomorrow; then, I require to make sure that everything is placed appropriately."