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The bit stream $01001$ is differentially encoded using $\text{'Delay and Ex OR'}$ scheme for $\text{DPSK}$ transmission. Assuming the reference bit as a $'1'$ and assigning phases of  $'0'$ and $\pi$ for $1$’s and $0$’s respectively, in the encoded sequence, the transmitted phase sequence becomes

1. $\pi 0 \pi \pi 0$
2. $0 \pi \pi 00$
3. $0 \pi \pi \pi 0$
4. $\pi \pi 0 \pi \pi$