Let (left(B_{t}ight)_{t geqslant 0}) be a (mathrm{BM}^{1}). Decide which of the following processes are Brownian motions: a)

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Let \(\left(B_{t}ight)_{t \geqslant 0}\) be a \(\mathrm{BM}^{1}\). Decide which of the following processes are Brownian motions:

a) \(X_{t}:=2 B_{t / 4}\);

b) \(Y_{t}:=B_{2 t}-B_{t}\);

c) \(Z_{t}:=\sqrt{t} B_{1}\)

\((t \geqslant 0)\).

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