(a) When instituting post-grant review, the Board will authorize the review to proceed on all of the challenged claims and on all grounds of unpatentability asserted for each claim. (b) At any time prior to institution of post-grant review, the Board may deny all grounds for unpatentability for all of the challenged claims. Denial of all grounds is a Board decision not to institute post-grant review. (c) Post-grant review shall not be instituted unless the Board decides that the information presented