[单选题]
The circuit below consists of a cell and two id7zl5qv0mk, owg ;: mzxentical resistors in paralek + ;upbn30 7uprdr6vlel, with an ideal ammek p uu0p6n+bev 3drr7;ter in one 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