Which of these charts has only one data series

Design a pos circuit that displays the letters a through j on a seven-segment indicator. the circuit has four inputs w, x, y, and z which represent the last 4 bits of the uppercase ascii code for the letter to be displayed. thus, if wxyz = 0001 then "a" will be displayed. (any answer with 22 or fewer gates and inverters, not counting any for the inputs, is acceptable)

Melissa needs to add a topic to an email that she will send to her teacher. choose the name of the field where she should type her topic.

Which of the following examples has four beats in each measure?