Who incited David to take a census, God or Satan?

In both 2 Samuel and 1 Chronicles, David takes a census of the soldiers of Israel. However, the two accounts disagree about what prompted him to do so.

According to 2 Samuel, God incited David to take the census:

Again the anger of the Lord was kindled against Israel, and he incited David against them, saying, ‘Go, count the poeple of Israel and Judah.’ [2 Samuel 24:1 (NRSV)]

What 2 Samuel attributes to God, however, 1 Chronicles attributes to Satan:

Satan stood up against Israel, and incited David to count the people of Israel. [1 Chronicles 21:1 (NRSV)]

So who incited David to take the census, God or Satan?