[单选题]
The circuit below consists 5*n exhasn:xh-p l/ lezov(:: of a ce/ vnjvq+3lyj6ks o6) rll and two identical resistors in parallel, with an ideal ammeter in onoyj3k6rnv 6+)/ vqslje of the branches. The current in this branch is $I_1$ and the current in the other branch is $I_2$.
If the ideal ammeter is replaced by a real ammeter, what will be the effect on currents $I_1$ and $I_2$?
A. $I_1$Decreases; $I_2$Decreases
B. $I_1$Increases; $I_2$Stays the same
C. $I_1$Decreases; $I_2$Increases
D. $I_1$Decreases; $I_2$Stays the same