$2)$This problem$-$based learning $($PBL$)$ question involves encoding$/$decoding using a Bifid cipher. Consider the following secret message: BBHYY ACWWL NTAZA PLLBS CHQOT PIAIt has been encoded using a Bifid cipher with key Polytechnic and period or block size $5.$Search the Internet for information about Bifid Cipher, to help you understand the method.a$)$Show $5$x$5$ Polybius square with horizontal key.b$)$Decode the message.c$)$ Show your work.