Question: How to name rows and columns in DataFrames and Matrices F in R?

1. data frame: names() and rownames() matrix: colnames() and row.names()
2. data frame: names() and row.names() matrix: dimnames() (not sure)
3. data frame: colnames() and row.names() matrix: names() and rownames()
4. data frame: colnames() and rownames() matrix: names() and row.names()

Answer: The correct answer of the above question is Option B:data frame: names() and row.names() matrix: dimnames() (not sure)