Which statement below is wrong?

To simplify the DC circuit analysis, the $\backslash (\backslash$mathrm$\{$V$\}\_\{\backslash$mathrm$\{$CE$\}\}\backslash )$ is $0\mathrm{.}2$ V in npn$\text{'}$s saturation mode.

To simplify the DC circuit analysis, the $\backslash (\backslash$mathrm$\{$V$\}\_\{\backslash$mathrm$\{$BE$\}\}\backslash )$ is $0\mathrm{.}7$ V in npn$\text{'}$s active mode.

In BJT$\text{'}$s active mode, the collector current is the sum of the base and emitter current amplitudes.

The saturation edge of the npn BJT is when $\backslash (\backslash$mathrm$\{$V$\}\_\{\backslash$mathrm$\{$BC$\}\}=0\mathrm{.}4\backslash$mathrm$\{$~V$\}\backslash )$