TP$8$ and TP$10$ are two proprietary protocols for wireless remote control applications. TP$8\text{'}$s symbol rate is $8,000$ symbols$/$second$,$ while TP$10\text{'}$s symbol rate is $10,000$ symbols$/$second$.$ Each of the protocols transmits symbols in equal time intervals. The duration of the time interval between two consecutive symbols in TP$8$ and TP$10$ is denoted as IST$8$ and IST$10$ respectively. From the following statements, select all that correctly define the symbol periods of both protocols.