If the ________ is left blank, the file name and application name display instead

In the following pseudocode, which value is the accumulator?

``` Set x = 0 For m = 1 To 10 Set x = x + m End For Display x ``` a. x b. m c. x + m d. there is no accumulator

What will be matched by the following ed regular expressions? (Tip: If you're using them in other contexts, you should omit the backslashes

* [0-9]\{3\} xx* [0-9]\{3,5\} x\{5,\} ^\... x\{10\} [A-Za-z_][A-Za-z_0-9]* [0-9]* ^Begin$ [0-9][0-9][0-9] ^\(.\).*\1$