A task comprises $7$ elements. Upon adequate sampling, it took the task $84$ seconds to complete, on average. Performance rating is $90\%$ and allowance is set at $12\%,$ based on the constant method. Identify the correct statement$($s$)$ below. Negative points apply to the wrong selection$($s$).$

Standard time: $85\mathrm{.}91$ seconds

Standard time: $93\mathrm{.}33$ seconds

Observed time: $84$ seconds

Normal time: $75\mathrm{.}6$ seconds

Normal time: $84\mathrm{.}67$ seconds

Normal time: $10\mathrm{.}8$ seconds

Standard time: $12\mathrm{.}10$ seconds

Observed time: $12$ seconds