Table:
($ in millions)

For the year ended December 31:	2019	2018	2017

RSUs

Granted	$674	$583	$484

Vested	428	381	463

PSUs

Granted	$164	$118	$113

Vested	118	101	51

This image depicts a table. How many rows and columns does this table have? Output the final answer as JSON in the format {"row_number": "m", "column_number": "n"}.

There are 8 rows and 4 columns in the table. So, the final answer is {"row_number": "8", "column_number": "4"}.