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Four jobs are on order in a factory. As on day $20$ of the production calendar, the corresponding due date and work remaining to complete these jobs (in days) are given in the table below.

\[
\begin{array}{|c|c|c|}
\hline
\text{Job} & \text{Due date} & \begin{array}{c}
\text{Work remaining} \\
\text{(in days)}
\end{array} \\
\hline
M & 26 & 5 \\
\hline
N & 24 & 10 \\
\hline
O & 28 & 10 \\
\hline
P & 31 & 5 \\
\hline
\end{array}
\]
Which job(s) has/have critical ratio less than unity?

  1. Job $\text{N}$ and Job $\text{O}$
  2. Job $\text{M}$ and Job $\text{N}$
  3. Job $\text{P}$
  4. Job $\text{O}$ and Job $\text{P}$

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