Which one is correct? A comma can be used to:

separate items in a series
separate an independent clause from a dependent clause
separate two dependent clauses
separate two nouns

Use commas to separate words and word groups in a simple series of three or more items. Example: My estate goes to my husband, son, daughter-in-law, and nephew. Note: When the last comma in a series comes before and or or (after daughter-in-law in the above example), it is known as the Oxford comma.

Use commas to separate words and word groups in a simple series of three or more items

gandhi had lead a successful campaign of nonviolent civil resistance to british rule, which led to india's independence. good luck

explanation: