I don't think I want to go into a lot of detail here, but the answer is
"sometimes true and sometimes false". I believe it depends on the
original difference between XC and XL, before XC began to change.
it just depends on the situation some times yes sometimes no
I think it's C. if we're talking about a rover.
But if it's a rocket that's computerized and automatic (synonym of unmanned)... Then it's B.
Downstream, the current is helping the swimmer go faster relative to the land
